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Effect of natriuretic peptides (NP) on conduit vasomotor tone. Segments of internal mammary artery, radial artery, and saphenous vein were precontracted with U46619 and exposed to the indicated concentrations of (A) atrial NP (ANP), (B) brain NP (BNP), and (C) C-type NP (CNP). Relaxation response of the internal mammary artery and radial artery are similar and significantly greater than that of saphenous vein.
