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Fig. 3. The electrophysiological effects of leucokinin-VIII (1 µmol l-1) on Aedes Malpighian tubule segments with (A-D) or without (E-H) stellate cells. N, nucleus; PC, principal cell; SC, stellate cell; SJ, septate junction. Values are means ± S.E.M. (N, number of Malpighian tubules). Asterisks indicate significant difference (P<0.05).