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Fig. 3. Effects of 500 µmol l–1 cyclic guanosine monophosphate (cGMP) on transepithelial fluid secretion (A), on the concentrations of Na+, K+ and Cl in secreted fluid (B), and on transepithelial rates of Na+, K+ and Cl secretion in isolated Malpighian tubules of A. aegypti (C). Values are means ± S.E.M.; N=24 tubules (A), N=12 tubules (B,C); *P<0.05, paired Student's t-test.