Gordon's PLOS Biology paper of 18 September 2026 finds that lower-body pieces of Ciona robusta, a solitary sea squirt, rebuild, and upper-body pieces do not. A larger stem-like pool does not flip the outcome by itself. Local metabolic, immune and differentiation signals still mark which wound closes.
Science··Morning
Two cuts, one animal
Gordon and colleagues compare, in PLOS Biology on 18 September 2026, slices of Ciona robusta that heal and slices that do not. Fragments taken from the lower body rebuild; fragments taken from the upper body do not. Ciona is a solitary sea squirt, an invertebrate chordate. The paper does not demonstrate the same switch in human tissue. That split is the result, not a metaphor. A reader should not treat a sea-squirt cut as a protocol for a clinic. The journal article is both the news card and the study record used here.[1]
Cells that still can, after a graft
The group used cell sorting, single-cell transcript counts, grafts and lineage tracing. They point to a pool of cells that, once moved, still divide and take on new jobs. Sequence deposits are listed as PRJNA1313632 and PRJNA1328382. Those accessions let another lab retrieve the reads. They do not, by themselves, show that a stem-cell count predicts which Ciona cut closes. The paper keeps the methods and the regional outcome in one argument.[1]
Place still decides
Healing still follows local metabolic, immune and differentiation signals more than how many stem-like cells sit in the piece. Abundance is not the switch. The authors contrast regenerative and non-regenerative anatomy in the same species. No second newsroom's own page on this PLOS Biology result turned up in the bounded corroboration check. ScienceDaily, Live Science and ESA were carrying other items that day. The card therefore stays on the journal record.[1]
