the cyclic melanotropin , [ cys4 , cys10 ] -alpha-msh , is inactivated in rat brain homogenate as is the shorter ac- [ cys4 , cys10 ] -alpha-msh4-10-nh2 analogue , but neither cyclic melanotropin is inactivated upon incubation in serum from rats .
C0002302
alpha-msh
C0026667
melanotropin