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(A) Mean lumen-positive transepithelial voltage (Vte; ±s.e.m.) of posterior midguts in the absence (hatched bar) and presence (gray bar) of serotonin (0.2 μmol l−1). *P<0.05 (B) Photographs of a preparation of the posterior midgut of larval (4th instar) Aedes aegypti, after 5 min of perfusion stop, in the absence (left) and in the presence (right) of serotonin (0.2 μmol l−1).
