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Fig. 2. Summary of ion fluxes in the four regions of the anal papilla in
vivo. Negative values denote influx of ions from the bathing medium into
papilla, and positive values denote efflux of ions from the papilla into the
bathing medium. H+ and K+ fluxes were significantly
higher in region 1 (asterisks; K+ flux: ANOVA P<0.01;
Tukey-Kramer P<0.05; H+ flux: ANOVA P<0.05;
Dunn's test P<0.05). There were no regional differences in
Na+, Cl- and NH4+ fluxes. Values
are mean + S.E.M. (Na+, N=5; Cl-,
N=7; H+, N=6; K+, N=5;
NH4+, N=7).