Fig. 2. Effect of (A) histidine, (B) cysteine or (C) taurine solutions upon retained and absorbed Zn(II) fractions following perfusion of in vivo cannulated intestine in combination with 50 µmol l–1 Zn(II). Retained Zn(II) fraction represents the fraction of perfused Zn(II) accumulated in the animal over the course of the 3-h perfusion (100 % of the control is equal to a retained Zn(II) fraction of 27 %), whereas absorbed Zn(II) fraction represents the proportion of perfused Zn(II) accumulated in post-epithelial compartments (100 % of the control is equal to an absorbed Zn(II) fraction of 11 %). Control data are consistent across all three plots. Values are means ± S.E.M. of 4–6 replicates for amino acid treatments, and of 10 replicates for control values. *Significant differences between control and treatment, 
between D- and L-stereoisomers, and 
between treatment concentrations were tested at P<0.05, ANOVA.
