pigment epithelium of eye
http://purl.obolibrary.org/obo/UBERON_0007625
http://purl.obolibrary.org/obo/UBERON_0000970
http://purl.obolibrary.org/obo/UBERON_0019304
http://purl.obolibrary.org/obo/UBERON_0000483