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Tracings of aqueous-methanolic leaf extract of P. rubra against PE (1 μM)-induced contraction in rabbit aorta strip (a); K+ (80 mM) induced contraction (b); vasorelaxing dose–response curve of P. rubra (c); and verapamil (d) against PE (1 μM) and K+ (80 mM)-induced contractions). All the values (n = 5) are depicted as mean ± SEM.
