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The binding of both insulin and glucagon to receptors in plasma membranes from five hepatomas of varying growth rates was diminished when compared to plasma membranes from normal liver. Scatchard analyses of the binding data suggested that the decrease in glucagon binding was due to a decrease in binding capacity, whereas the decrease in insulin binding was due either to a decrease in binding affinity or to site-site interactions. The decreased binding of insulin, but not of glucagon, showed a significant correlation with increasing growth rate of the tumors. These data suggest, therefore, that decreased binding of insulin to receptors could be a feature of increasing growth rate in hepatomas.
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V Pezzino, and
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Cancer research,
V Pezzino, and
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