Cell diversification: differing roles of cell lineages and cell-cell interactions.
D000818:Animals; D002356:Cartilage / Q000166:cytology; D002450:Cell Communication; D002454:Cell Differentiation; D002455:Cell Division; D002478:Cells, Cultured; D002642:Chick Embryo; D005121:Extremities / Q000196:embryology; D051379:Mice; D009132:Muscles / Q000166:cytology