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Katrina Velle

@katrinavelle.bsky.social
2.5K followers 2.5K following 132 posts

Assistant Professor @ UMass Dartmouth. Interested in actin, amoebae, microscopy, and sciart. she/her katrinavelle.wixsite.com/science

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Reposted by Katrina Velle
Anh Hoang Le, PhD 🏳️‍🌈🏴󠁧󠁢󠁳󠁣󠁴󠁿🇻🇳 @anhhle2702.bsky.social · 02/10/2026
Happy #FluorescenceFriday. Single immune cell migration is fascinating. But these cells can also behave like a coordinated collective, like 🐝 from a hive. I captured some embryonic myeloid cells (🔴) displaying swarming behaviour in a migrating ectoderm cell sheet (🔵), like neutrophils in our body!
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Katrina Velle @katrinavelle.bsky.social · 29/09/2026
Heads up to other October NIH deadliners-- if you didn't do this already it appears you do not have to.
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Jenn Kong @jennkong.bsky.social · 26/09/2026
It's the beginning of the school year for us. I don't know about you, but my inbox is full of undergrad requests to join the lab. I can't offer them all positions, so instead I wrote a bit of advice on the process. Feel free to share if you find it helpful. www.thekonglab.org/blog/looking...
thekonglab.org
Looking for an undergraduate research position? A PI’s advice — Kong Lab
One of the greatest joys of being a PI is mentoring the next generation of scientists. At a large public university (Woohoo… Go Dawgs!), I have the amazing luxury of hearing from many enthusiastic stu...
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Katrina Velle @katrinavelle.bsky.social · 26/09/2026
In case it is useful for anyone out there, here’s a thread of papers that have worked well for journal clubs in my advanced cell bio class (~15 undergrads + 5 grad students) Please add your own favorites, or your own work if you think it’s suitable! (1/6)
static.klipy.com
ALT:
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Michael Way @drmichaelway.bsky.social · 26/09/2026
Arp2/3 iso-complexes strike again! Axonal actin ring assembly and maintenance involves different iso-complexes that change expression during neuronal maturation 🎉 Great collaboration with Ana Rita Costa & Monica Sousa @ i3S in Porto www.i3s.up.pt/research-gro... www.science.org/doi/10.1126/...
science.org
Distinct Arp2/3 isocomplexes drive axonal actin ring assembly and integrity
The actin-related protein 2/3 (Arp2/3) complex is a central nucleator of branched actin filaments, essential for numerous cellular processes. Using superresolution imaging, we demonstrate that Arp2/3 ...
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Katrina Velle @katrinavelle.bsky.social · 25/09/2026
Yup- I just got this warning in Cayuse.
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Katrina Velle @katrinavelle.bsky.social · 23/09/2026
Love free to publish. Don’t love AI microtubules. I think this creature will haunt my nightmares…
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Katrina Velle @katrinavelle.bsky.social · 21/09/2026
I’m gonna choose to believe that Barbara McClintock took to illustrating Fraggle Rock books in between maize growing seasons. I will not fact check this.
The cover of a children’s book called “what’s a Fraggle?” Written by Louise Gikow with pictures by Barbara McClintock
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Jeremy Reiter @reitergroup.bsky.social · 18/09/2026
What in the world am I looking at here? @Nikon? www.nikonsmallworld.com/galleries/20...
nikonsmallworld.com
Abnormal beating of airway cilia from a child with Primary Ciliary Dyskinesia (PCD) | 2026 Small World in Motion Competition
Ning Xu - Abnormal beating of airway cilia from a child with Primary Ciliary Dyskinesia (PCD), a genetic disorder affecting respiratory function.
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FocalPlane @focalplane.bsky.social · 15/09/2026
Don’t miss the second webinar in our new series on cell migration, featuring talks from @ankita13jha.bsky.social, @raphclement.bsky.social and @katrinavelle.bsky.social. 🗓️Thursday 17 September at 15:00 BST For more info and to register: focalplane.biologists.com/2026/09/03/f...
focalplane.biologists.com
FocalPlane features... cell migration webinar 2 - FocalPlane
FocalPlane features... cell migration webinar 2 - News
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Michael Baym @baym.lol · 13/09/2026
Ten years ago Tami, Roy, and I released a movie we made of antibiotic resistance evolving in real time. I thought maybe a couple thousand people tops would see it. I couldn't have imagined it would be seen millions of times, and be taught from middle school through the graduate level worldwide
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Maitreyi Das @daslabpombe.com · 10/09/2026
NIGMS MIRA is officially here! This was one of the longest waits ever, but I'll take it. Also, we have openings for a couple of postdoc positions in cell biology/biochemistry. Details to follow soon.
static.klipy.com
Cookie Monster Dancing
ALT: Cookie Monster Dancing
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Institut Necker Enfants Malades @inem-necker.bsky.social · 07/09/2026
🔬 New publication, now out in #ScienceImmunology led by Mathieu Deygas in Pablo Vargas team, shows that Adaptive motility enables neutrophils to rapidly navigate confined capillaries 📰 To read the article: tinyurl.com/52vxuhmp
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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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Katrina Velle @katrinavelle.bsky.social · 03/09/2026
I'm very excited to be included in this lineup! Thanks @pjsaez.bsky.social and @valeriaventurini.bsky.social for organizing!
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Katrina Velle @katrinavelle.bsky.social · 03/09/2026
Teaching advanced cell bio this morning and including a cautionary note about using AI. So I asked AI to draw a microtubule, thinking it would have subtle but important errors. But wow. I think dissecting everything wrong here could take all semester! Maybe a fun exam question?
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Hauke Drechsler @hd-sci.bsky.social · 28/08/2026
Free unasked advice: If you want to illustrate your paper but you cannot make polished illustrations yourself - it's ok to go with basic illustrations made in power point or to get a professional illustrator/artist to do these things for you. Using AI, however, to look bold and deliver this slop: /1
AI-generated scheme showing a kinesin motor melting into a microtubule
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Katrina Velle @katrinavelle.bsky.social · 26/08/2026
I’m not sure this graphical abstract helps me understand the article, but it did bring me joy, so 10/10. doi.org/10.1016/j.de...
A cartoon tortoise labeled TORtoise
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Ankita Jha @ankita13jha.bsky.social · 23/08/2026
May be it only works for me but I have been using blebbing cells as calming patterns :)
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The Company of Biologists @biologists.bsky.social · 11/08/2026
We are gathering feedback from our readers, authors and reviewers about the use of AI tools in scholarly publishing. Have your say at: www.surveymonkey.com/r/ZBFC663
Community survey: The role of AI tools in scholarly publishing — announcement from The Company of Biologists, showing five stylized people and three speech bubbles to represent community discussion.
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Andrew Kennard @askennard.bsky.social · 19/08/2026
The kinetochore is essential for cell division across species, but its components and organization evolve dramatically. How can that be? Our first foray into this fascinating question is up now on biorxiv: 🧪 1/12 www.biorxiv.org/content/10.6...
biorxiv.org
Kinetochore diversification in Naegleria reveals plasticity in the kinetochore-microtubule interface
The kinetochore--the molecular machine that couples chromosomes to spindle microtubules--performs an essential, tightly regulated function, yet varies dramatically across eukaryotes. Microtubules are ...
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Isabella Backman @izzybackman.bsky.social · 19/08/2026
For @science.org , I wrote about brain-eating amoeba 🦠 and fascinating new research led by @katrinavelle.bsky.social which could help explain how the usually harmless pond-dweller ends up in the brain. www.science.org/content/arti...
science.org
‘Brain-eating amoeba’ appears to love crawling into narrow spaces
Claustrophilic behavior may help Naegleria fowleri find food—and accidentally travel up the human nasal cavity
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Katrina Velle @katrinavelle.bsky.social · 12/08/2026
✨dung fiber amoeba✨
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Artologica aka Michele Banks @artologica.net · 25/06/2026
NO AI SLOP ONLY BRAIN, PAPER, PAINT and PIGMENT www.etsy.com/shop/artolog... Support real artists
9 different watercolors with text, mostly with anti-AI or anti-tech messages
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George O'Toole (he/him/his) @geiselbiofilm.bsky.social · 23/06/2026
Our Dept of Microbiology & Immunology @Geisel School of Medicine @Dartmouth has an opening for an Assistant Professor. Looking for programs bridging multiple areas in Micro & Immuno. A great place to be! Programs: www.M2P2.org www.dartmouthbiofilm.org Job ad: apply.interfolio.com/187637
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onishilab.bsky.social @onishilab.bsky.social · 17/06/2026
The Onishi lab produced its first PhD. Congratulations Dr. Samed Delic! You can read some of his thesis work here: pubmed.ncbi.nlm.nih.gov/38994454/ pubmed.ncbi.nlm.nih.gov/41959007/
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Katrina Velle @katrinavelle.bsky.social · 17/06/2026
Maybe I should have submitted a grant about using amoebae to clean reflecting pools…
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Pablo J. Sáez @pjsaez.bsky.social · 04/06/2026
1 week to start🔥 New @focalplane.bsky.social webinar series focused on #CellMigration, register & join us▶️, it will be fun! pls spread the word, in the next one, ECRs could apply to show their work ;) ▶️ to register: focalplane.biologists.com/2026/05/29/n... @dgz.bsky.social @the-node.bsky.social
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Iñaki Ruiz-Trillo @multicellgenome.bsky.social · 09/06/2026
1/10 For decades, cellular aggregation was considered an evolutionary dead end. Cells could come together temporarily. But complex multicellular organisms like animals? Our study, led by JP Gerdt, with Ruibao & @jennahed.bsky.social suggests it may be time to rethink that🧵 #ProtistsOnSKy
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Arif Ashraf @aribidopsis.bsky.social · 03/06/2026
(1/11) Excited to share the brand-new cell division preprint from the lab! In this manuscript, chemical biology (in a collaboration with @rnett42.bsky.social Ryan’s lab) meets the cell biology (our lab). Harmala alkaloids regulate cell division planes in plants www.biorxiv.org/content/10.6...
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Katrina Velle @katrinavelle.bsky.social · 09/06/2026
After a long hiatus, happy #MicroscopyMonday! Here are some amoebae squeezing themselves into narrow channels (part of a video for our preprint pubmed.ncbi.nlm.nih.gov/41377514/). Sound effects by Dillon (my 4 month old who may have had a little to do with the bluesky hiatus!)
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Joachim Goedhart @joachimgoedhart.bsky.social · 08/06/2026
Find the latest version of SuperPlotsOfData here: uva-nl.shinyapps.io/SuperPlotsOf... It supports multi-file upload and now has the option to jitter the large dots (mean of median of replicates) No jitter Jitter
Superplot-style plot without jitter of the means of replicates - not all means visible due to overlapSuperplot-style plot with jitter of the means of replicates - all means visible!
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The Company of Biologists @biologists.bsky.social · 04/06/2026
ECRs – apply by 12 June for a funded place at our Workshop on Rethinking Cell Differentiation and Development: A Unicellular Perspective, organised by Elena Casacuberta & James Gahan @jgahan.bsky.social Find out more at biologists.com/workshops/de... #BiologistsWorkshops
Card with event details:

Workshop: Rethinking Cell Differentiation and Development: A Unicellular Perspective
Organisers: Elena Casacuberta and James Gahan

Date: 6 – 9 December 2026

Venue: Buxted Park, East Sussex, UK
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Tamas Nagy @tamasnagy.com · 30/05/2026
Got to play around with Holotomographic imaging of muscle cells yesterday via the @uclastemcell.bsky.social imaging core and the results are pretty spectacular 🤩 You can see everything from mitochrondria to lamellipodia to macropinocytosis…with no labels!
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Yuki Maekawa @gatohamu.bsky.social · 29/05/2026
This is my first paper. A brief introduction of myself.
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Bwins @ben-wins.bsky.social · 29/05/2026
For no reason at all, here is a picture of my dog on a ferry last summer
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Dr. Kat Napaaqtuk❄️ @napaaqtuk.bsky.social · 17/05/2026
These responses are wild. Academic research is reading papers and building your work based on what you've read in other people's published articles. How are they getting trained in academia without knowing the basics of research?
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Laura Eme @lauraeme.bsky.social · 13/12/2025
Microbial eukaryotes keep challenging assumptions about eukaryotic cell and genome biology. Our upcoming workshop explores the frontier of protist genomics and how it shapes cell biology, ecology and evolution. Please save the date! Talks, posters and ECR events Websites and details coming soon
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Michael Way @drmichaelway.bsky.social · 04/12/2025
Are you interested in cytoskeleton and looking for a postdoc position? I will be advertising positions in the new year but happy to chat in person if you are attending ASCB @ascbiology.bsky.social in Philadelphia. Just drop me a line.
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Katrina Velle @katrinavelle.bsky.social · 06/11/2025
Just under a month left—apply by December 5 through the link on my website!
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Omaya Dudin 𓂆 ¦🍉¦🦠¦🔬¦ @dudinlab.bsky.social · 31/10/2025
🚨Our collaboration with @centriolelab.bsky.social & @gautamdey.bsky.social is out today in @cp-cell.bsky.social We show that #Expansion #Microscopy is a broad-spectrum modality for Euks, enabling 3D phenotypic maps rooted to phylogeny. #ProtistsOnSky #SciComm #SciSky www.cell.com/cell/fulltex...
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Wout Oosterheert @woutoosterheert.bsky.social · 13/10/2025
Very excited that my final postdoctoral work is now online in Cell @cellpress.bsky.social. www.sciencedirect.com/science/arti... Using 16 (!) cryo-EM structures, we uncovered how the three proteins coronin, cofilin and AIP1 work together to rapidly disassemble actin filaments.
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Mark Peifer (He, him) @peiferlabunc.bsky.social · 13/10/2025
Incredible video, incredible work. This is a huge step forward in understanding both actin severing, and more broadly, how actin binding proteins change filament architecture and thus drive re-modeling 🧪
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Katrina Velle @katrinavelle.bsky.social · 08/10/2025
Happy #MicrosCreepy season!
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Katrina Velle @katrinavelle.bsky.social · 05/10/2025
PhD or Master's position available for Fall 2026! Interested in how actin drives cell crawling, eating, dividing, or osmoregulation? What about pathogenesis of a brain-eating amoeba? Or eukaryotic evolution? If so, apply through my website: katrinavelle.wixsite.com/science/cont... Please share!
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Theory of Living Matter Group @tlmcambridge.bsky.social · 03/10/2025
🚨 TLM Online Seminar Series - 08.10.25 | 16:00 UK Pablo Sáez: "Decision-making during cell migration" Please repost & to attend online please register to our 📧for the zoom link: lists.cam.ac.uk/sympa/subscr...
Poster with a picture of the speaker, Pablo Saez, advertising his talk: Decision Making during cell migrations. Abstract: Moving cells navigate inside living tissues often encountering obstacles and junctions, where their path branches into alternative directions of migration. This is the case of cells moving on top or within blood vessels, which often bifurcate into branches. Cells have diverse migratory strategies that differentially rely on the adhesion to the substrate. Cells that undergo mesenchymal migration are highly dependent on the adhesion to the substrate, and when facing bifurcations are forced to coordinate the adhesion and detachment of the competing branches. Recent studies showed how the decision is made -to keep or retract a branch and choose a new direction- when there is bias: open versus dead-end, differences in pressure, presence/absence of a chemoattractant. However, much less is know about how cells decide a new direction when the decision is unbiased. Similarly, it is poorly understood how migrating cells coordinate membrane dynamics during branching to maintain a good trade-off between microenvironmental exploration and migratory efficiency. Here, we use in vitro live-cell imaging using different levels of complexity, and advanced image analysis to analyze the response of migrating cells when facing symmetric junctions, and extreme branching when cells simultaneously face several bifurcations. We found that actin and membrane dynamics play a key role to choose a new direction path in both cases i) when cells face a single junction (Ron et al. 2024), and ii) when cells exhibit high levels of branching because they face several junctions at the same time (Liu et al.). In addition, we found that migrating immune cells have a fine tune regulation of branching in order to coordinate surveillance and migration. These results shed light on the mechanisms by which cells resolve unbiased junctions and branching during cell migration.
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Ankita Jha @ankita13jha.bsky.social · 29/09/2025
If anyone ever wants to brush up on a lot of cell migration concepts don't forget we have several wonderful scientists who have given talks previously in cell migration seminars. I find it so comforting to go look at old videos, maybe someone else who will do as well!! youtube.com/@cellmigrati...
youtube.com
Cell Migration Seminars
Cell Migration Seminars every Tuesday at 16:00 BST.
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Michael Way @drmichaelway.bsky.social · 16/09/2025
And now for something completely different @tianyang22.bsky.social & #YanCao uncover of how SPIN90 dimers activate Arp2/3 to nucleate bidirectional linear actin filaments. Great collaboration with @romet-jegou-lab.bsky.social & @carolynmoores1.bsky.social #Cryo-EM #Arp2/3 rdcu.be/eGoH4
rdcu.be
Arp2/3-mediated bidirectional actin assembly by SPIN90 dimers
Nature Structural & Molecular Biology - Liu et al. show that SPIN90 dimerizes and binds two Arp2/3 complexes to nucleate two bidirectional actin filaments and the dimerization domain is...
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Katrina Velle @katrinavelle.bsky.social · 16/09/2025
”Please inhibit responsibly: Natural and synthetic actin toxins as useful tools in cell biology” I had a lot of fun going down different actin inhibitor rabbit holes with @onishilab.bsky.social on this perspective! www.molbiolcell.org/doi/10.1091/... www.molbiolcell.org/cms/10.1091/...
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Journal of Cell Biology @jcb.org · 12/09/2025
@fritzlaylin.bsky.social et al. propose a simple way to highlight both experimental #reproducibility & cell-to-cell variation, while avoiding pitfalls common in analysis of cell biology data rupress.org/jcb/article/... 📕 Reproducibility & Best Practices in Cell Biology: rupress.org/jcb/collecti...
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