irradiated host mice were reconstituted with bone marrow cells from a second strain of mice : the two strains were each homozygous for one of the two different isoenzyme forms of the enzyme glucose-6-phosphate isomerase , which enable cells of the two strains to be identified by different isoenzyme mobilities on starch gel electrophoresis .
C0014442
enzyme
C0022173
isoenzyme