part_of part of part of contained in develops_from develops from existence overlaps existence starts during or after material entity Stage 5 Stage 6 Stage 7 Stage 8 non ciliated epithelial cell Category 4 cell https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4464 PMID:22439894 PMID:25017721 PMID:26457503 Post-mitotic, mesenchymally and epidermally located progenitors downstream of the Category 3 cells. Planarian_Anatomy PMID:28072387 PMID:18786419 epidermal progenitor cell Category 3 cell dorsal region of the epidermis anterior region of the whole animal dorsal region of the whole animal posterior compartment of the whole animal juvenile head prepharyngeal region parapharyngeal region tail epidermal cell non-ciliated epidermis adult hermaphrodite asexual adult copulatory region