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Fig. 9. Effects of (A) 0.1 mmol l1 and (B) 1.0 mmol
l1 cimetidine on secreted fluid [TEA] for whole Malpighian
tubules. Tubules were bathed in saline alone for the first 20 min. Either 0.1
mmol l1 TEA (open symbols) or cimetidine (filled symbols)
was added at 20 min. At 60 min either cimetidine (open symbols) or 0.1 mmol
l1 TEA (filled symbols) was added.