alterations in differentiation ( tyrosinase activity ) were determined in cells exposed to either melanocyte-stimulating hormone ( msh , 10 ( -7 ) m ) , theophylline ( 10 ( -3 ) m ) , n6 , o2'-dibutyryl cyclic amp ( db-camp , 10 ( -4 ) m ) , or prostaglandin e1 ( pge1 , 10 ( -6 ) m ) .
C0007589
differentiation
C0007634
cells