Head regeneration of the hemichordates, Ptychodera flava
Uncut, intact animal through post-amputation and regenerated status, which showed a new head (G) approaching final size to match original body is attached to original anterior cut stump. Arrowheads showed the newly regenerated section.
Image credit: Reprinted by permission from Frontiers, Ancestral stem cell reprogramming genes active in hemichordate regeneration, Humphreys et al., 2022.
Image usage restrictions: News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only.
Image appeared in the press release "Looking to the acorn worm for clues: Why vertebrates cannot regenerate their bodies."