zone of skin (...) it is well-established that neural crest cells contribute to both the dermal skeleton (craniofacial bone, teeth, and the caudal fin rays of teleosts) and the integument, including craniofacial dermis and all pigment cells outside the retina (...).[well established][VHOG] Any portion of the organ that covers that body and consists of a layer of epidermis and a layer of dermis. EHDAA2:0001844 EHDAA:6530 EMAPA:17525 EV:0100152 FMA:86166 GAID:933 MA:0000151 MAT:0000284 MESH:D012867 MIAA:0000284 Note the distinction between the entire skin of the body, of which there is only 1 in an organism, and zones of skin, of which there can be many. Examples: skin of knee OpenCyc:Mx4rvVjX3ZwpEbGdrcN5Y29ycA UBERON:0000014 VHOG:0000860 http://upload.wikimedia.org/wikipedia/commons/6/6d/Skin.svg http://upload.wikimedia.org/wikipedia/commons/e/e8/HumanSkinDiagram.jpg portion of skin region of skin skin skin region skin zone uberon we assume that mouse, HOG and GAID all mean zone of skin when they say skin. We also choose skin as an exact synonym, as it is more intuitive organ part