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Fig. 3. Time course of the effects of 0.3 mmol l-1 cyanide (KCN) on the basolateral membrane voltage (Vbl), input resistance (Rpc), and the virtual active transport current (Iat(virt)) in a representative principal cell, and on intracellular ATP concentrations [ATP]i in 6-16 sets of five Malpighian tubules each. Values are mean ± S.E.M. (number of tubule sets). The temporal relationship between the electrical variables and [ATP] are approximate because exchanging the peritubular medium to include CN took 43 s in the electrical assay and 10 s in the ATP assay.





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