b-Melanotropin (Squalusacanthias), 3-L-isoleucine-7-L-methionine-13-glycine-14-L-alanine-16-L-methionine-16a-L-asparticacid-16b-L-lysine-; L-Lysine, L-a-aspartylglycyl-L-isoleucyl-L-a-aspartyl-L-tyrosyl-L-lysyl-L-methionylglycyl-L-histidyl-L-phenylalanyl-L-arginyl-L-tryptophylglycyl-L-alanyl-L-prolyl-L-methionyl-L-a-aspartyl-
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