 Hofstinium Iemia is a small marine worm that can regenerate its entire body after injury or removal. Using single cell RNA sequencing, researchers were able to identify four distinct cell types within the worm's adult stem cell population, including one type of stem cell that does not appear to be specialized into any particular tissue. The researchers also found that these stem cells have similar gene expression patterns regardless of whether they are from the head, tail, or middle of the worm. This suggests that the same genes control the behavior of all stem cells in the worm, suggesting that the same processes may be involved in regenerative capacity in other animals. This article was authored by Ryan E. Hewlett, Julian O. Kimura, Demosella bolognese, and others.