Isoenzymes of glucose-6-phosphate isomerase (GPI: E.C. 5.3.1.9) were used as markers to determine the origin of cells which give rise to new muscle formed in allografts of whole intact muscle. GPI isoenzymes were also employed to see whether host precursor cells, which have been shown to contribute to muscle formation in grafts of minced muscle, can be derived from muscle lying adjacent to grafts.
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