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Fig. 8. Glibenclamide blocks amaranth transport. Eight tubules were arranged radially for classical (Ramsay) secretion assays (Dow et al., 1994): the bathing drops are just out of shot. Droplets were collected every 10 min, and so the colour of the droplets provides a correlate of real-time amaranth transport. (A) Secreted drops before glibenclamide was added. (B) Secreted droplets 35 min after glibenclamide was added to the final concentrations (in mmol l-1) shown. Drops labelled `C' had no glibenclamide added to the bubbles. The concentration of amaranth in the reservoir bubbles was 2 µmol l-1.





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