the agents used were 4- ( 3-butoxy-4-methoxybenzyl ) -2-imidazolidinone ( r020-1724 ) , which is an adenosine 3',5'-cyclic monophosphate ( camp ) phosphodiesterase inhibitor that has never been tested on melanoma cells in culture , and d-alpha tocopheryl succinate ( vitamin e succinate ) , which has previously been shown to inhibit growth and induce morphological differentiation in melanoma cells .
C1513095
melanoma cells
C0025202
differentiation