Abstract
1. 1. Starch gel electrophoresis at pH 8·6 resolved five anodally migrating groups of isozymes, denoted a, i, b, d and e. The groups exhibited differential tissue expression. 2. 2. At least twenty-one isozymes were observed: five a- and d-, four i- and b- and three e-group isozymes. 3. 3. In duodenum/pyloric caeca extracts, a- and b-group isozymes were expressed exclusively in females. A unique group, the mobility of which overlapped that of the b- and d-groups, was found in males. 4. 4. The most anodal i-group isozyme of skeletal muscle exhibited variable expression. 5. 5. All isozyme groups appeared to be immunologically distinct. 6. 6. The molecular weight of the tetramer was estimated to be ~ 140, 000; that of the monomer, ~ 35,000.
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