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Cell Biology and Aging Section, Department of Veterans Affairs Medical Center, San Francisco, California 94121.
Experiments undertaken to investigate the binding of epidermal growth factor by hepatocyte nuclei showed that: (a) isolated nuclei from both normal and regenerating rat liver are capable of binding 125I-epidermal growth factor, (b) the nuclear epidermal growth factor-binding protein is similar in molecular weight to the plasma membrane epidermal growth factor receptor, (c) monoclonal antibodies produced against the plasma membrane epidermal growth factor receptor recognize the nuclear epidermal growth factor receptor and (d) the nuclear receptor has an affinity for epidermal growth factor comparable to that of the plasma membrane receptor, but fewer (approximately 10%) nuclear receptors are available per protein unit compared with the plasma membrane.
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