when the cells were incubated in ca2+-free medium ( ca2+ omitted , egta 2 mmol/l ) , the avp-induced as well as the k+ depolarization-induced increase in free cytoplasmic ca2+ were abolished , whereas the ionophore ionomycin evoked a rapid transient elevation of free ca2+ .
C0007634
cells
C0010834
cytoplasmic