several of the morphological characteristics of normal fibroblasts are regained when the cells are incubated with dibutyryl-cyclic amp or butyryl-cyclic amp ( 0.1-1 mm ) , or cyclic amp ( 3 mm ) plus theophylline ( 1 mm ) , but not with atp , adp , amp , adenine , or adenosine ( 1-7 mm ) .
C0016030
fibroblasts
C0007634
cells