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Effects of 3 mM [Ca2+]o and ISO on Ca2+ transient decline in the presence of KN-93. A: representative traces of matched [Ca2+]i amplitudes with 3 mM [Ca2+]o + KN-93 (black) and ISO + KN-93 (gray). B: pooled data (means ± SE) of Ca2+ decline with 3 mM [Ca2+]o + KN-93 (black) or ISO + KN-93 (gray). C: pooled data (means ± SE) of Ca2+ transient decline time intervals with 3 mM [Ca2+]o + KN-93 or ISO + KN-93. *P < 0.05 vs. corresponding 3 mM [Ca2+]o (n = 15 cells/4 hearts).
