title: Why do hormone receptors arise? An introduction.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002462:Cell Membrane / Q000378:metabolism; D003600:Cytosol / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D006728:Hormones / Q000378:metabolism* / Q000502:physiology; D008954:Models, Biological; D010802:Phylogeny; D011956:Receptors, Cell Surface / Q000502:physiology*
chemical_list: D006728:Hormones; D011956:Receptors, Cell Surface; D004247:DNA