N-ω-Nitro-L-arginine methyl ester (L-NAME), phenylephrine hydrochloride, tetraethylammonium (TEA), glibenclamide, 4-aminopyridine (4-AP), 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), indomethacin, atropine, propranolol, sodium chloride (NaCl), potassium chloride (KCl), sodium bicarbonate (NaHCO3), magnesium sulfate (MgSO4), calcium chloride (CaCl2), potassium dihydrogen phosphate (KH2PO4), and glucose were all purchased from Sigma–Aldrich, Inc. (St. Louis, MO, USA).
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