Endothelium-derived relaxing factor (EDRF) exerted no inhibitory effect on papillary muscles or the rat portal vein. Externally applied acetylcholine did not reach aorta endothelium to stimulate the EDRF release in rabbits, nor bradykinin in the pig coronary artery segments. Acetylcholine penetrated, however, canine femoral artery wall and stimulated the release of EDRF. Stabilizing of the EDRF released from perfused rabbit thoracic aorta, seems to be possible.

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