part_of part of part of develops from sigma neoblast zeta neoblast zeta class zeta class neoblast PMID:29674431 PMID:29674432 PMID:26651295 PMID:28292427 PMID:25956527 zeta-class neoblast zeta zeta-neoblast PMID:27013241 PMID:29158443 PMID:28757112 PMID:25017721 PMID:27542689 PMID:27150006 An abundant neoblast subclass consisting of p53+, zfp1+ progenitors required for maintenance and regeneration of epidermal cell type(s). PMID:29906446 PMID:29557542 PMID:26457503 Planarian_Anatomy https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4407 PMID:28807897 epidermal progenitor cell neoblast integumental system