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Electrical activity of a wild-type (mXinα+/+) RA-PV-LA preparation in the absence (panel A) and presence (panel B) of cardioactive drugs (1 μM ISO, 10 μM stroph. and 0.1 μM atropine) recorded with the MED64 system. The right panels show the fast-speed recordings after pacing in the presence of cardioactive drugs at three time points (indicated by a, b and c).
