Abstract

Using isoelectric focusing with one ampholytic solution, double- and single-banded amylase phenotypes were found in a sample of rhesus monkeys,Macaca mulatta. When applying different ampholytic solutions, these variants were shown to change their position relative to each other. Single-banded phenotypes showed either a position corresponding to one of the bands of the double-banded phenotype or to an intermediate one. Family studies, however, suggested that the differences between the observed patterns were not caused by genetic differences. This discloses a problem with respect to the interpretation of electrophoretic data, i.e. bands with different positions produced by isoelectric focusing may not necessarily represent genetic differences.

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