the camp phosphodiesterase inhibitor dl-4- ( 3-butoxy-4-methoxybenzyl ) -2-imidazolidinone ( ro20-1724 ) was shown to be completely nontoxic to t10t1/2 cells at 10 ( -4 ) m , yet when added to mixed cultures of t10t1/2 cells and postconfluence growth-arrested 10t1/2 cells , colony formation and [ 3h ] thymidine incorporation into t10t1/2 cells were virtually eliminated .
C0007595
growth
C0007634
cells