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Fig. 2. Temporal stability of tetraethylammonium (TEA) influx recorded at a single site in the lower Malpighian tubule (LMT) on each of two tubules (circles, squares). Tubules were bathed in saline containing 100 µmol l–1 TEA. Each point is the mean of three measurements at the same site at intervals of 2.5 min.