comparative in situ immunoperoxidase localization studies document the presence in these cells of four contraction-associated proteins ( smooth muscle isotropomyosin , cyclic guanosine monophosphate-dependent protein kinase , both nonmuscle and smooth muscle isomyosin , and actin ) in amounts generally greater than those found in connective tissue fibroblasts , but less than in smooth muscle cells .
C1267092
smooth
C1135918
smooth muscle cells