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Changes in myocardial contractility index (+dP/dtmax) evoked by selective inhibition of eNOS (L-NIO, 20 mg/kg i.p., panel A), nNOS (NPLA, 1 mg/kg i.p., panel B), or iNOS (1400W, 5 mg/kg i.p., panel C) or equal volume of saline (0.9% NaCl) in telemetered ovariectomized (OVX), or estrogen-replaced OVX (OVXE2) rats. *P<0.05 vs. saline values; +P<0.05 vs. L-NIO (OVX) values.
