Fig. 4From: Relaxant effects of a hydroalcoholic extract of Ruta graveolens on isolated rat tracheal ringsDose–response curves for carbachol constructed in the presence of the R. graveolens extract (15, 30, and 45 μg/mL). Symbols and vertical bars represent means and SEM (n = 4 biological replicates). Data with different superscript symbols differ significantly among groups: p < 0.05Back to article page