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Figure 2 Vasomotor Function in Saphenous Vein Segments From Control and Heart Failure Groups

(A) Mean concentration-response relationship for acetylcholine (ACh). (B) Mean concentration-response relationship for sodium nitroprusside (SNP). (C) Relative endothelial-dependent relaxation (maximum response to ACh normalized by the maximal response to SNP). *p < 0.05 by Mann-Whitney test.