Animal variation in alanine uptake by rabbit ileal mucosa

Alanine uptake by rabbit ileal mucosa has been measured in the presence and absence of Na⁺ to establish the characteristics of biological variation. Common $\text{K}{}_{\mathrm{<mtext>m</mtext>}}$ values, calculated for two systems of alanine entry, were used for estimation of two J_max values for individual rabbits. The distribution of and within the population was normal and there was minimal interaction between these two parameters, judged by a cross-correlation analysis. Ways of processing data to account for this type of animal variation are discussed.