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Fig. 6. Effects of verapamil on tetraethylammonium (TEA) flux (left ordinate) and differential signal (right ordinate) in the lower, main and distal segments of the Malpighian tubule. Mean values + S.E.M. (N=5) are shown for the same tubules before (filled bars) and 20–30 min after (open bars) the addition of verapamil (5 µmol l–1) to saline containing 100 µmol l–1 TEA. The asterisk indicates a significant (P<0.05) reduction in TEA influx after the addition of verapamil.





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