Fig. 5.

a The uptake and release cycles for equine erythrocytes compared with b the corresponding reductions in AA-PBS and increases in PBS, when the cells were exposed to nine cycles of sequential exposures to AA-PBS medium and PBS (n = 3). Fresh erythrocytes were subjected to a repetitive series of 2-min incubations in pre-warmed (37 °C) PBS (purple cycles 1 (equilibration), 3, 5, 7 and 9) or AA-PBS (pink cycles 2, 4, 6, and 8). Significant changes in erythrocyte concentrations of amino acids have been marked; *p < 0.05; **p < 0.01; ***p < 0.001