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Publikováno v:
Rossiiskii fiziologicheskii zhurnal imeni I.M. Sechenova. 84(12)
Isometric contractions and force-frequency relationships (FFR) were assessed in isolated ventricular preparations of 3- and 4-day chick embryos (EM) and posthatched (PH) chicks. Pacing protocols for the FFR assessment were applied in normal buffer, b