Fig. 2From: Relaxation matters: comparison of in-vitro vasodilatory role of botulinum toxin-A and papaverine in human radial artery graftsFlow-chart of the experimental procedures. KCL: potassium chloride (80 mM), BTX-A: botulinum toxin A (10− 8 M or 10− 6 M), papaverine (10− 6 M or 10− 4 M), cumulative 5-HT (10− 9 M - 10− 6 M), cumulative ET-1 (10− 12 M - 10− 8 M)Back to article page