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Fig. 3. (A) Representative scan of tetraethylammonium (TEA) flux at locations along
the lower Malpighian tubule (LMT) and ureter. Tubules were bathed in saline
containing 100 µmol l1 TEA. The length of each arrow
corresponds to the magnitude of TEA influx and the axis of each arrow
indicates the axis of the TEA-SeR microelectrode's movement. (B) TEA influx
(left ordinate) and differential signal (right ordinate) in the LMT, distal
ureter and proximal ureter. The proximal ureter is defined as the 50% of the
ureter length closest to the gut. Each bar shows mean +
S.E.M. for N=6 preparations.