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The change in diameter over 2 min of contractions at contraction frequencies of (A) 6 CPM, (B) 15 CPM and (C) 60 CPM at a constant stimulus frequency of 20 Hz in the absence (▪) and presence (▴) of the phospholipase A2 inhibitor quinacrine. The line with the * indicates the range over which the dilatation in the presence of quinacrine was significantly different from control dilatation.
