immunolabeling of ultrathin sections of polyvinylalcohol-embedded smooth muscle distinguished two domains in the smooth muscle cell : ( a ) actomyosin domains , made up of continuous longitudinal arrays of actin and myosin filaments , and ( b ) longitudinal , fibrillar , intermediate filament domains , free of myosin but containing actin and alpha-actinin-rich dense bodies .
C1267092
smooth muscle
C1135918
smooth muscle cell