James Zwierzynski

@jamesbzsci.bsky.social

farm kid turned PhD candidate in Kristy Red-Horse's lab | NSF GRFP fellow | 🏳️‍🌈 | working on:🤰🏻🔬🫀🧬🐭 🧫

Do you know any students who are planning to apply to graduate school this cycle? Encourage them to apply to the Biology Preview Program! We provide intensive workshops to help students w/ their applications + 1:1 mentorship.

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Why do guinea pigs naturally develop collateral arteries while other species don't? Check out this wonderful preprint from our lab using in vivo Peturb-seq to discover differences in tip cell programming contribute to artery formation in guinea pig development!

bioRxiv Developmental Biology@biorxiv-devbio.bsky.social · 3mo ago

A Perturb-seq screen guided by species divergence uncovers pathways for collateral artery formation https://www.biorxiv.org/content/10.64898/2026.04.29.721711v1

I'm now on Bluesky!🤗 Excited to share our preprint, reviving Kristy Red-Horse's interest in the placenta from her PhD ~20 years ago! We find using 3D imaging that the mouse placenta is far more invasive than previously thought. Furthermore, we find a surprise from our favorite chemokine CXCL12...🧵:

bioRxiv Developmental Biology@biorxiv-devbio.bsky.social · 4mo ago

3D imaging of the pregnant uterus reveals an extensively invasive mouse placenta requiring CXCL12-CXCR4 signaling https://www.biorxiv.org/content/10.64898/2026.04.06.716785v1