Human heterozygosity: a new estimate.

Abstract
Several hundred polypeptides from 4 human diploid fibroblast cell lines were compared by high-resolution 2-dimensional polyacrylamide gel electrophoresis and double-label autoradiography under conditions where allelic products that differ by a single charged amino acid would be distinguished. The average heterozygosity represented by this set of gene products appears to be < 1% for changes involving charged amino acids.