contained in existence overlaps material entity stem cell female primordial germ cell Planarian_Anatomy https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4407 PMID:17390146 Cells expressing nanos that are located ventrally in the location that the ovaries form. Primordial germ cells are present in both asexual adults and sexual hermaphrodites. This term may be redundant with oogonial stem cell. anterior region of the whole animal ventral region of the whole animal juvenile stage female germ cell head region prepharyngeal region adult hermaphrodite asexual adult