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Figure 3 Relations between the maximal constrictor response to ACh from the baseline diameter and PLC activity (A), between the maximal constrictor response normalized by ISDN and PLC activity (B), between the average response to ACh from the baseline diameter and PLC activity (C) and between the average response normalized by ISDN and PLC activity (D). Open circles = control subjects without coronary spasm; solid circles = patients with CSA. See text for details.