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Fig. 2. Effect of L-channel blockade with nifedipine (Nif) on the response of RGA in nominally calcium-free Ringer to the addition of external Ca2+. Values are means ± S.E.M. Nifedipine given pre- (N=8) or post- (N=9) calcium addition did not have any statistically significant effect on the [Ca2+]i response. Base, baseline value.