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Cnidarian developmental mechanisms group

@clytia-vlfr.bsky.social
417 followers 257 following 31 posts

at the LBDV (Laboratoire de Biologie du Développement de Villefranche-sur-mer)

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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 07/10/2026
@imev-mer.fr !!
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ZooCELL MSCA-Doctoral Network @zoocell.bsky.social · 06/10/2026
🇫🇷 🪼 Meet our partner, the Institut de la Mer de Villefranche (IMEV)! Our next ZooCELL partner takes us to Villefranche-sur-Mer, on the French Mediterranean coast. IMEV is one of Sorbonne University’s three marine stations and is jointly affiliated with the @cnrs.fr .
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 07/10/2026
@biodev-vlfr.bsky.social !
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ZooCELL MSCA-Doctoral Network @zoocell.bsky.social · 06/10/2026
Two LBDV teams contribute to ZooCELL: 🔬 Cnidarian Developmental Mechanisms (@clytia-vlfr.bsky.social) led by Evelyn Houliston and Tsuyoshi Momose. 🧬 Genome and Protein Evolution in Animals, led by Richard Copley.
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 07/10/2026
Impressive work Kata! @zoocell.bsky.social
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Thibaut Brunet @thibautbrunet.bsky.social · 02/09/2026
🚨 New preprint alert! 🚨 Choanoflagellates reorganize their global cytoskeletal architecture within seconds to explore confined microspaces. This is the main PhD work of the amazing @maitefreired.bsky.social www.biorxiv.org/content/10.6... A tread 🧵⬇️
biorxiv.org
Rapid repurposing of microvillar content drives a flagellate-to-amoeboid switch in the closest relative of animals
Animal cells extensively remodel their cytoskeleton during differentiation and can notably switch between two major motility modes: flagellum-based swimming and actin-based crawling. We previously sho...
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Luis Alberto Bezares Calderón @lbezarescalderon.bsky.social · 16/08/2026
Our team is recruiting a PhD student to investigate the evolution of pressure sensation in Zooplankton! The project will use marine invertebrate larvae to explore the molecular, cellular, and neuronal mechanisms behind this fascinating sensory system. More details here: bit.ly/3TTeF4Q
bit.ly
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 19/09/2026
Evidence collected by successive lab members over many years that neural cells in the Clytia larva have two origins: From 'i-cells' located in endoderm and by delamination of the gastrula ectoderm. doi.org/10.1242/dev.... @biodev-vlfr.bsky.social @annaferraioli.bsky.social
The two proposed neurogenesis pathways during Clytia larval development
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Institut de la Mer de Villefranche/Mer (IMEV) @imev-mer.fr · 17/09/2026
🎊 21è anniversaire des premières colonies permanentes de Clytia hemisphaerica 🪼en laboratoire ! Les premières cultures X, Y & Z de cette hydroméduse commencèrent en 2002 @biodev-vlfr.bsky.social Après 3 ans de croisements, les lignées Z "pionnières" voient le jour ! @sorbonne-universite.fr @cnrs.fr
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 18/09/2026
Nous sommes heureuse cette semaine d'acceuillir des amis de Clytia du monde !
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Michalis Averof @michalis-averof.bsky.social · 19/04/2026
The paper we just published is a collaboration of 12 labs spread across 7 countries, covering sea squirt (shown here), sea urchin, beetle, crustacean, roundworm, ragworm, flatworm, jellyfish, sea anemone & choanoflagellate. Comparing the results identified tags that work well across many species 7/9
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 20/04/2026
This fits the general principle of ZGA being triggered by a 'universal' Genome: Cytoplasm ratio across animals! - and thus a highly conserved mechanism involving titration of a maternal cytoplasmic factor on chromatin.
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 20/04/2026
So, by providing staged embryo mRNA for this beautiful wide comparative study, we now know that zygotic gene activation in Clytia occurs in the early blastula with 512 cells, at around 5hpf (Here termed ZGA cell cycle 9).
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Michalis Averof @michalis-averof.bsky.social · 19/04/2026
Finding molecular tags that localise fluorescent proteins to the cell membrane was the goal of our latest paper, now published in Development @dev-journal.bsky.social. The tags act as address labels, sending proteins to the cell membrane, where they highlight the shape and arrangement of cells. 2/9
journals.biologists.com
Targeting the cell membrane in established and emerging model organisms
Summary: Screening a toolkit of diverse membrane-localising tags identifies candidates that efficiently localise proteins to the plasma membrane in a wide range of animals and choanoflagellates.
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Michalis Averof @michalis-averof.bsky.social · 19/04/2026
These images show live embryos of animals (jellyfish, crustacean, worm, sea urchin, sea squirt, beetle) and one of animals closest single-celled relatives. They were captured taking advantage of fluorescent proteins localised on the outer membrane of cells, allowing us to observe cell outlines. 1/9
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ulrichtechnau.bsky.social @ulrichtechnau.bsky.social · 29/03/2026
Only 1 weeks to apply (April 7) for the joint Master program on "Evolutionary Genomics and Systems Biology" in Vienna. studieren.univie.ac.at/en/admission... Cool program with hands-on experience taught by leading scientists in PopGen, EvoDevo, Evolutionary Systems Biology. Spread it!
studieren.univie.ac.at
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 22/03/2026
www.quantamagazine.org/the-jellies-...
quantamagazine.org
The Jellies That Evolved a Different Way To Keep Time | Quanta Magazine
Off the coast of Japan, biologists netted a pea-size jellyfish with an unusual circadian clock — a chance finding that suggests there are likely more overlooked biological timekeeping mechanisms to be...
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Moe Mahjoub @mahjoublab.bsky.social · 13/03/2026
Happy #FluorescenceFriday all! Checkout these beautiful basal bodies in airway #multiciliated cells expanded via U-ExM 😍 Images captured by the super talented @maneesha07.bsky.social on a #Nikon NSPARC 🔬.
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 15/03/2026
More fascinating jellyfish research from Noriyo Takeda, Ryusaku Deguchi and colleagues: A lovely example of speciation in action, as populations of Cladonema pacificum withmorning and evening spawning become reproductively separated. bioone.org/journals/zoo...
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Anna Ferraioli @annaferraioli.bsky.social · 05/03/2026
I’m beyond excited to see our work published in Science Advances! 🎉 Deeply grateful to everyone involved — and especially to @pawelburkhardt.bsky.social for the great mentorship ✨ www.science.org/doi/10.1126/...
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Vicky Prince @vprincelab.bsky.social · 21/02/2026
I'm thrilled to be co-teaching this wonderful course again this fall. Come join us at the MBL for a transformative experience!
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Gaspar Jekely @jekely.biologists.social.ap.brid.gy · 18/02/2026
In @eLife: Neural connectome of the ctenophore statocyst doi.org/10.7554/eLife.108420 Version of record of our ctenophore nerve-net connectome paper.
elifesciences.org
Neural connectome of the ctenophore statocyst
Volume EM and connectome reconstruction of the apical organ of a ctenophore combined with high-speed imaging reveals a neuronal coordination of balancer cilia in the gravisensory organ.
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 18/02/2026
Introducing a Clytia planula cell atlas, and demonstrating broad-level relations with medusa cells via another updated atlas. By @annaferraioli.bsky.social with @juliarmateu.bsky.social and collaborators in a project led by @rcply.bsky.social @biodev-vlfr.bsky.social www.biorxiv.org/content/10.6...
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Frank Schnorrer @frankschnorrer.bsky.social · 16/02/2026
Two funded PhD positions investigating the evolution of sarcomeres @ibdm.bsky.social in @biancah0406.bsky.social and our lab, together with @cnidevo.bsky.social - Interested to explore how similar or different Jellyfish sarcomeres are to Drosophila or human ones? www.ibdm.univ-amu.fr/ibdm_job/2-a...
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PLOS Biology @plosbiology.org · 08/01/2026
#Jellyfish rely on light cues to help time their #gamete release. @momotsuyo.bsky.social &co reveal an additional autonomous #circadian mechanism that synchronizes gamete release, entrained to a 24-hr period by dark-to-light transition @plosbiology.org 🧪 plos.io/4btAwpY
Clytia sp. IZ-D, a newly identifed jellyfish species from Izushima Island, on the Pacific coast of Japan. Life-cycle diagram (top left) and images of each stage (top ight; a–f) of Clytia sp. IZ-D, which is morphologically very similar to the model species Clytia hemisphaerica. Magenta arrows in the gonozoid cartoon (c) indicate individual medusa buds. Arrows in the mature female medusa photo (e) point to the four gonads in the subumbrella. Bottom: Illustration of spawning regulation in Clytia sp. IZ-D. This species spawns every evening, unlike the closely related C. hemispharica, which spawns in the morning. Surprisingly, in both cases, it is sunrise, not sunset, that provides the temporal cue for spawning. In Clytia sp. IZ-D at 21°C, spawning occurs 14 hours after sunrise, regardless of sunset timing. A further surprise is that a 20-hour spawning rhythm is maintained even under constant light. Such autonomous circadian gamete release has not previously been reported in cnidarians (jellyfish, corals, or sea anemones). Future molecular studies using this Clytia species are expected to shed light on the mechanisms underlying light-controlled reproduction in marine organisms. Illustration by Ruka Kitsui.
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PLOS Biology @plosbiology.org · 09/01/2026
In hydrozoan #jellyfish, the timing of gamete release is often coordinated by light. Ezio Rosato explores a @plosbiology.org study that elucidates a novel, endogenous clock-based mechanism that governs #egg release in a new species of jellyfish 🧪 Paper: plos.io/4btAwpY Primer: plos.io/49eTOya
Rhythmic ovulation in Clytia species. Top row: In Clytia hemisphaerica, the oocytes develop (blue arrow) becoming competent to respond to the maturation-inducing hormone (MIH), which triggers meiosis. MIH (red triangle) is released by neurosecretory cells in the gonads when they become exposed to light. After completion of meiosis (about 2 hours), the mature eggs are released. Ovulation (green square) lasts about 10 min. Since light is required to start a cycle, whose duration is regulated by the developmental programme, in C. hemisphaerica rhythmic ovulation is analogous to an hourglass. Bottom row: In Clytia sp.IZ-D light is required for synchronous development of the oocytes (blue arrow). However, the final maturation process, which makes them responsive to MIH, is gated by an unknown mechanism that likely operates individually in each oocyte (black-and-blue arrow). Light also drives the accumulation and progressive release of MIH. Meiosis begins when the oocytes reach the right maturation stage and MIH the right concentration. After about 2 hours ovulation begins, lasting about 60 min (green box). Together, the timing mechanisms controlling oocyte development and MIH release constitute an incipient clock. Two light-dark cycles are shown for reference.
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 07/01/2026
Now out in PLOS Biology- a novel clock mechanism regulating spawining in a newly-identified Clytia species : dx.plos.org/10.1371/jour...
dx.plos.org
A light-entrained clock mechanism in a hydrozoan jellyfish synchronizes evening gamete release
Jellyfish rely on light cues to help coordinate the timing of their gamete release. By characterizing a new species of jellyfish, this study reveals an additional autonomous circadian mechanism that s...
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@MEmilieTerret @memilieterret.bsky.social · 03/01/2026
Happy 2026! As usual now, jellyfish in Paris @clytia-vlfr.bsky.social
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Andy Baxevanis @baxevanislab.bsky.social · 25/11/2025
We've updated our Hydractinia Genome Project Portal! The site includes genomic, transcriptomic, and proteomic datasets, genome browsers, an interactive single-cell gene expression atlas, proteome-scale structure predictions, a custom BLAST interface, and more. Check it out! tinyurl.com/hydractinia
academic.oup.com
The Hydractinia Genome Project Portal: multi-omic annotation and visualization of Hydractinia genomic datasets
AbstractMotivation. The colonial hydroid Hydractinia exhibits several unique biological properties, including its remarkable regenerative capacity and the
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Philip Donoghue @phil-donoghue.bsky.social · 20/11/2025
Come and do a PhD on 'Genome duplication, extinction and diversification in the evolution of flowering plants' with myself @jameswclark.bsky.social and Ilia Leitch @bristolpalaeo.bsky.social and join the @wgdip.bsky.social studying rediploidisation. Apply: tinyurl.com/26pmfvvc by Jan 8
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 19/11/2025
Drawing together findings from several projects over many years, we make a case that neural cell types in the Clytia larva have two embryological origins: i-cells and ectodermal. bioRxiv 2025.11.17.688882; doi: doi.org/10.1101/2025...
Separation of the Early gastrula into oral and aboral halves shows that some neural cell tupes derive from aboral ectoderm, and others from i-cells
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Peter Lenart @plenart.bsky.social · 18/11/2025
Apply to join us! 🪼🪳🪱🐌
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 23/10/2025
Tested in Clytia too - by @sassaf.bsky.social and @momotsuyo.bsky.social !
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Max Telford @maxjtelford.bsky.social · 11/07/2025
Is the deuterostome clade an artifact??? New paper with first author @anaserrasilva.bsky.social, Laura Piovani, Paschalis Natsidis and project co-led by Paschalia Kapli. www.sciencedirect.com/science/arti...
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 11/07/2025
Bravo @juliarmateu.bsky.social et @annaferraioli.bsky.social, merci à Richard Copley pour ce travail co-dirigée, et merci aux collaboratrices coralistes Isabelle Domart-Coulon (MNHN, Paris) et Núria Teixidó (LOV, et Ischia Marine Center, Stazione Zoologica Anton Dohrn)
Anti-LWamide staining of the aboral (anterior) end of a Clytia larva
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 07/07/2025
Interested in visiting Villefranche, Roscoff or Banyuls marine stations? The EMBRC-France (www.embrc-france.fr) 8th Call for Projects is open. Deadline Sept 19 for stays by end of June 2026. Up to 42 person-days per project are covered, with access to EMBRC-France services, accommodation & catering.
embrc-france.fr
Accueil | EMBRC France
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Julia Ramon Mateu @juliarmateu.bsky.social · 17/05/2025
Excited to finally see my PhD work published! We identified specialized cells in jellyfish and coral larvae with shared features and potentially linked to settlement regulation.
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Casey Dunn @caseywdunn.bsky.social · 13/05/2025
Our chromosome-scale genome assembly of Nanomia septata, a siphonophore - doi.org/10.1101/2025... . Much larger than many other cnidarian genomes, fewer chromosomes, and highly rearranged. No smoking gun for how they achieve complex colony-level organization. Great work Namrata Ahuja and friends!
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 17/05/2025
"Aboral cell types of Clytia and coral larvae have shared features and link taurine to the regulation of settlement" Kudos to Julia Ramon-Mateu and Anna Ferraioli @biodev-vlfr.bsky.social, and thanks to our collaborators for their coral larva expertise www.science.org/doi/10.1126/...
science.org
Aboral cell types of Clytia and coral larvae have shared features and link taurine to the regulation of settlement
Larvae of jellyfish and corals have specialized sensory cells with shared features potentially linked to settlement regulation.
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Max Telford @maxjtelford.bsky.social · 12/05/2025
New entry into the sponge/ctenophore debate.... Have the chromosome fusions separating ctenophores from all other animals been given too much weight? Beautifully clearly written paper covering complex arguments from @rcply.bsky.social. www.biorxiv.org/content/10.1...
biorxiv.org
Sponges, ctenophores and the statistical significance of syntenies
Shared fusions between ancestral chromosomal linkage groups have previously been used to support phylogenetic groupings, notably sponges with cnidarians and bilaterians to the exclusion of ctenophores...
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Max Telford @maxjtelford.bsky.social · 24/04/2025
It's publication day of my first book: The Tree of Life. The tree of life is a time machine that can take us back 4 billion years to meet our most distant ancestor. It is the magic that lets us tell the origin stories, beginning with this ancient relative, of everything from mushrooms to man.
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 05/05/2025
Intriguing findings from our Sendai collaborators Ruka Kitsui and Ryusaku Deguchi. While C. hemispherica spawns at dawn, Clytia IZ-D species spawns at dusk. This is not triggered by dark but, unexpectedly, by light-mediated extension of an autonomously-running 20h cycle. doi.org/10.1101/2025...
Cartoon of autonomous and light-modulated spwning cycles in Clytia IZ-D
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genikhovich.bsky.social @genikhovich.bsky.social · 04/03/2025
www.nature.com/articles/s41...
nature.com
The Hydractinia cell atlas reveals cellular and molecular principles of cnidarian coloniality - Nature Communications
Here they generate a cell type atlas of the colonial cnidarian Hydractinia symbiolongicarpus, which reveals that distinct colony parts are mostly made from unique combinations of shared cell types, an...
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CNRS Biologie @cnrsbiologie.bsky.social · 28/02/2025
🤝 @cnrscotedazur.bsky.social @sorbonne-universite.fr @clytia-vlfr.bsky.social Lire l'article dans @elife.bsky.social 👉 buff.ly/439XGxG
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 29/01/2025
Now out as a Reviewed Preprint on eLife - Thanks to the reviewers for their positive and constructive assessments! elifesciences.org/reviewed-pre...
elifesciences.org
Planar cell polarity coordination in a cnidarian embryo provides clues to animal body axis evolution
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Nicolas Minc @minclab.bsky.social · 03/01/2025
Our lab has multiple open positions for post-docs to study the regulation and function of cytoplasm mechanics during embryo development. Details below 👇👇 Please Repost !!! @ijmonod.bsky.social @cnrs.bsky.social
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 09/01/2025
This will be great !
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cnidofest.bsky.social @cnidofest.bsky.social · 07/01/2025
Big exciting news! The next Cnidarian Model Systems Meeting, better known as Cnidofest, will be held at the Marine Biological Laboratory from September 23-27, 2026. Mark your calendars!!! After two land-locked meetings, we are returning to an ocean view!!! 🌊🪸 @mblscience.bsky.social
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@MEmilieTerret @memilieterret.bsky.social · 03/01/2025
Happy 2025! Jellyfish in Paris @clytia-vlfr.bsky.social
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Development @dev-journal.bsky.social · 16/12/2024
ARPP19 phosphorylation site evolution and the switch in cAMP control of oocyte maturation in vertebrates Read this Research Article by Ferdinand Meneau, Marika Miot and colleagues @clytia-vlfr.bsky.social: doi.org/10.1242/dev.202655
Figure 1 (C) In situ hybridization detection of ClyARPP19 mRNA in a whole newly budded young medusa recently released from the polyp colony, and an adult ovary. Cartoons show tissue organization. ARPP19 mRNA is strongly detected in oocytes, around the bell rim where the nerve rings are positioned, and at the sites of neural stem cell populations. (D) Confocal images of Clytia oocytes stained with the anti-XeENSA antibody (a) or with the anti-XeENSA antibody pre-absorbed with ENSA protein (b). In each pair, images in the left are of anti-ENSA staining and images on the right are of DNA stained with Hoechst. The oocyte nucleus (GV) is positioned opposite the attached gastrodermal cells (gas)
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