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Fig. 10. Secretion rate and secreted fluid pH for 4th instar Rhodnius tubules pre-incubated for 2 h in 20 mol l-1 glutamine (filled circles), 20 mol l-1 arginine (open circles) or amino-acid-free saline (filled squares). Values are means ± S.E.M. (N=8 tubules for each group). Asterisks represent significant (P<0.05) increases or decreases relative to controls.