Fig. 3. Patterns of whole body Cu concentration (y, µmol g^–1 wet mass) with time (x, weeks) during exposure to low waterborne and low dietary Cu levels (A), and to normal waterborne and high dietary Cu levels (B). Values are means ± S.E.M., N=15 for weeks 0, 2 and 4, and N=9 for week 7 for each treatment. In A the negative relationship is best described by the exponential equation y=0.4268+0.6879exp(–0.5868x), r²=0.80, t_1/2=1.18 weeks; in B, the positive relationship is best described by the linear equation, y=0.5897+1.407x, r²=0.80. Equations were derived from individual data points.