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Changes in electrical activity induced by zinc protoporphyrin IX. Effects of CO (5 × 10-5 - 3 × 10-4M) on contractile force, maximal velocity of contraction (MVC) and maximal velocity of relaxation (MVR) in paced stripes of working atrial myocardium. The control values of contractile force, MVC and MVR were considered as 100%. The relative values of these parameters during action of CO are presented in % of control. * - p < 0.05 versus the respective control values.
