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Fig. 4. Concentration–response curves for tetraethylammonium (TEA) influx in the (A) lower Malpighian tubule (LMT), (B) Malpighian tubule main segment and (C) midgut. Each point is the mean ± S.E.M. of N=4–7 preparations. Values for Jmax and Kt were determined by non-linear regression analysis as described in the Materials and methods.