The isozyme distribution of glycogen phosphorylase (EC 2.4.1.1) was studied in adult rat liver and isolated non-parenchymal liver cells by means of immuno-titration. In adult rat liver, the L-type of glycogen phosphorylase was found to dominate, whereas the heterogeneous non-parenchymal liver cell population apparently contains all three glycogen phosphorylase isozymes.
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