A new variant of the Es-1 locus in the rat

A new prealbumin plasma esterase was demonstrated by the use of miniaturized polyacrylamide slab gel electrophoresis. Genetic analysis indicated that the new variant is controlled by the Es-1 locus and this gene was designated Es-1c. Among 11 rat strains only one strain, WJ, possessed the gene. Two random-bred stocks, Jcl:Wistar and Jcl:SD, also maintained it in their populations. Miniaturized polyacrylamide slab gel electrophoresis showed that the ES-1 band consisted of two close bands with the cathodal one staining darker.