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Abstract
Phosphofructokinase (PFK) isozymes of blood cells and some human tissues were studied by starch gel electrophoresis and immunoprecipitation by anti-muscle and anti-erythrocyte PFK sera. PFK from muscle, heart, brain and placenta were totally precipitated by both antisera. PFK from blood cells (erythrocytes, lymphocytes, granulocytes, platelets) were precipitated more strongly by anti-erythrocyte PFK serum than by anti-muscle PFK serum. Liver, kidney and monoblast PFK were slightly precipitated by both antisera. From the electrophoretic patterns and the immunoprecipitation curves we may conclude that muscle contains the homotetrameric M4 forms; platelet, liver and kidney the homotetrameric E4 form, and blood cells the M-E hybrids. Monoblasts probably contain a E4 type PFK precursor, and heart, placenta and brain, a modified M4 type PFK. Other isozymes, unrelated with muscle and erythrocyte, were revealed in liver and kidney.
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