Hydroxylamine hydrochloride, pyridine, magnesium sulphate, l-phenylephrine hydrochloride (PE), acetylcholine chloride (ACh), NG-nitro-l-arginine methyl ester (l-NAME) were bought from Sigma-Aldrich (St Luis, MO, USA). The metabolite and oxime were dissolved in DMSO (0.1% final concentration).
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