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Fig. 6. Interactions of leucokinin I (LK-I) and cyclic AMP (cAMP) on fluid secretion by isolated pharate adult M. sexta Malpighian tubules. LK-I (60 µmol l-1) or cAMP (1 mmol l-1) were applied at the times indicated by the arrows. Solid line and arrows: cAMP added first followed by LK-I; broken line and open arrows: LK-I added first followed by cAMP. Values are means ± 1 S.E.M. (N=8).