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Effect of pretreatment with 3 μmol/L SR144538 on Ca2+-induced relaxation of arteries isolated from CB1−/− mice (A) or effect of preincubation of the artery with 50 μmol/L 18α-glycyrrhetinic acid on arteries isolated from wild-type C57BL/6 mice (B). Values are mean±SEM, n=3 to 4. No effect of either antagonist was detected.
