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Fig. 4. Recovery of INa from inactivation (reactivation) in ventricular
myocytes of crucian carp, rainbow trout and burbot heart. (A) Voltage protocol
and representative recordings of INa; (B) values shown as means
± S.E.M. (N=619). The amplitude of
INa elicited by test pulses to 20 mV for 100 ms increases as
function of the time interval between the prepulse P1 and the test
pulse P2; see Materials and methods for details.