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Arjun Raj

@arjunraj.bsky.social

6.7K followers 1K following 412 posts

Just another LLM. Tweets do not necessarily reflect the views of people in my lab or even my own views last week. rajlab.seas.upenn.edu rajlaboratory.blogspot.com

Posts Replies Media

Arjun Raj @arjunraj.bsky.social · 17/12/2025

I just pinned a photo of a post-it to one of our lab Slack channels. Is this what they mean by "tech stack"?

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Arjun Raj @arjunraj.bsky.social · 15/11/2025

Also, here’s an accessible video intro:

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Arjun Raj @arjunraj.bsky.social · 26/10/2025

Super proud of Dr. @giannatbusch.bsky.social for successfully defending her thesis! Such a talented and wonderful human!

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Arjun Raj @arjunraj.bsky.social · 05/09/2025

My great pleasure to introduce DR. Aoife O’Farrell!! An incredible scientist and human being. @aofarrell.bsky.social not only produced an amazing thesis by her own sheer brilliance and will, but also provided tireless service to Penn Bioengineering. Will be sorely missed!

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Arjun Raj @arjunraj.bsky.social · 15/07/2025

The cool thing? This method discovered distinct cell populations in specific locations WITHOUT us telling it where to look. It reconstructs spatial organization without spatial information!

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Arjun Raj @arjunraj.bsky.social · 15/07/2025

We developed a new computational tool called the "L-metric" that finds cells with mutually exclusive gene expression. Think of it as spotting cells that are in an "either/or" state - they're committing to one fate while shutting down another.

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Arjun Raj @arjunraj.bsky.social · 15/07/2025

We tracked cells called NMPs as they differentiate and move through the gastruloid. Just like in real embryos, this happens as a smooth, continuous wave - cells don't just suddenly "decide" to become something new, they gradually transition while talking to their neighbors.

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Arjun Raj @arjunraj.bsky.social · 15/07/2025

We profiled dozens of gastruloids and found something remarkable: despite looking different on the outside, they're actually incredibly consistent on the inside. Cell types organize in predictable patterns, gastruloid after gastruloid. It's like they have a hidden blueprint!

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Arjun Raj @arjunraj.bsky.social · 07/05/2025

Wow, just implemented the new Cellpose-SAM from @computingnature.bsky.social in NimbusImage and it's *awesome*! Give it a try! nimbusimage.com

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Arjun Raj @arjunraj.bsky.social · 24/03/2025

Fun little convenience feature: Snapshots, which are like bookmarks for your data. Never struggle again to find where that image came from in your dataset. Also: easy export of movies to GIF!

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Arjun Raj @arjunraj.bsky.social · 10/01/2025

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Arjun Raj @arjunraj.bsky.social · 07/01/2025

Blog post: Documenting computational analyses by provenance vs. function rajlaboratory.blogspot.com/2025/01/docu...

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Arjun Raj @arjunraj.bsky.social · 28/12/2024

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Arjun Raj @arjunraj.bsky.social · 24/12/2024

Behold, my ornate UORBIT plot! Seriously, though, while I agree that UMAPs are not well-founded, they are successful in conveying a certain scientific aesthetic (in this case, the glory of big data). They are perhaps the epicycles of our time?

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Arjun Raj @arjunraj.bsky.social · 20/12/2024

From Fritz John:

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Arjun Raj @arjunraj.bsky.social · 03/12/2024

RNA FISH -> a fish

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Arjun Raj @arjunraj.bsky.social · 12/12/2023

Reposting our Penn Postdoctoral Fellowship in Genetics! www.med.upenn.edu/apps/my/bpp_...

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