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Effect of 3 mM [Ca2+]o and β-adrenergic type 2 receptor (β2-AR) agonist zinterol (Zint) on Ca2+ transient decline. A: representative traces of matched [Ca2+]i amplitudes with 3 mM [Ca2+]o (white) and Zint (gray). B: pooled data (means ± SE) of Ca2+ decline with 3 mM [Ca2+]o (white checkered) or Zint (gray checkered). C: pooled data (means ± SE) of Ca2+ transient decline time intervals with 3 mM [Ca2+]o or Zint. *P < 0.05 vs. corresponding 3 mM [Ca2+]o (n = 3 hearts/5 cells).
