Agouti Signaling ProteinReceptors, CorticotropinReceptors, MelanocortinAgouti-Related ProteinHair ColorMelanophoresalpha-MSHPigmentationMelanocyte-Stimulating HormonesIntercellular Signaling Peptides and ProteinsProteinsXenopusReceptor, Melanocortin, Type 1Molecular Sequence DataRecombinant Proteins