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Fig. 11. Transepithelial flux of quinacrine as a function of bathing saline
quinacrine concentration for isolated Drosophila tubules set up in
Ramsay assays. Each point shows the mean ±
S.E.M. for N=5 tubules. The solid
line represents the fit to the MichaelisMenten equation by non-linear
regression analysis. The inset shows the ratio of the concentration of
quinacrine in the secreted fluid to that in the bathing medium (S/M) as a
function of bathing medium quinacrine concentration.