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You provide cells in culture with 32P and treat them with insulin for 30 minutes. Following...

You provide cells in culture with 32P and treat them with insulin for 30 minutes. Following the treatment, you homogenize the cells and isolate the insulin receptors. The control cells received 32P, but no insulin. Insulin receptors from the insulin-treated cells were radiolabeled with 32P; the controls were not. Why?

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