247054.fig.004
Figure 4: Effect of Nigella sativa seed extract (14 mg/mL) on endothelium-denuded rat aortic rings (−E) contracted with PE (  M), in the presence of diltiazem (  M) (−E + Dil), after ruthenium red (  M) (−E + Dil + RR) or heparin (50 mg/L) (−E + Dil + HP) pretreatment. Data are expressed as mean ± S.E.M. ( ). , compared to −En; compared to −E + Dil.