High affinity, selective ANP clearance receptor (NPR3) antagonist (Ki
= 0.45 nM). Exhibits >20,000-fold selectivity for NPR3 over NPR1. Inhibits ANP-stimulated Na+
pump activity in rabbit ventricular cardiomyocytes in vitro
. Also blocks proliferation of rodent neonatal cardiomyocytes seen at low ANP concentrations in vitro
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