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Fig. 4. Effect of isoproterenol (ISO) on ICa and Ca2+
transient. (A) ICa elicited by repetitive 200 ms depolarizations
(0.2 Hz) to 0 mV in the absence (black line) and presence (gray line) of 1
µmol l1 ISO. (B) Ca2+ transients recorded
simultaneously with ICa in A. Traces are averages of recordings
from 7 cells at steady state. Filled symbols + solid line, no ISO; gray
symbols + dotted line, + ISO.