saponin at concentrations effective for skinning smooth muscle fibres ( 10-50 micrograms/ml ) inhibited ca2+ binding in the absence of atp to a similar extent in all fractions , but the inhibition of atp-dependent ca2+ accumulation was more pronounced in dog aorta microsomes and rat gastric fundus muscle plasma membranes than in rat vas deferens microsomes .
C1135918
smooth muscle fibres
C0026845
muscle