Fig. 2From: The protective effect of α-hederin, the active constituent of Nigella sativa, on tracheal responsiveness and lung inflammation in ovalbumin-sensitized guinea pigsCumulative log concentration-response curves of histamine-induced contraction of isolated trachea in the control (C), sensitized (S), sensitized pretreated with thymoquinone (S + TQ), sensitized pretreated with low-dose α-hederin (S + LAH) and high-dose α-hederin (S + HAH) guinea pigs in the organ bath (for each group, n = 7)Back to article page