Abstract
Soluble liver cell proteins were studied from two approaches: 1) electrophoretic mobility and 2) kinetics of specific radioactivity after injection of tritiated leucine into rats. The electrophoretic fractions were classified according to mobility, magnitude of highest specific radioactivity and how long after injection of the radioisotope the peak specific radioactivity occurred. These measurements were discussed in relation to the degree of heterogeniety of the electrophoretic fractions. Conclusions were that faster migrating fractions are less heterogeneous than those with slower mobilities, and with respect to the faster anodally migrating fractions, that they are probably intracellular proteins with a rapid metabolism or they represent sub-units of proteins.
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