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Because examination of regulatory trans-phosphorylations can help elucidate the cellular functions of tyrosyi protein kinases, we have investigated the effects of phosphorylation by casein kinase-1 on the activity of the p40 tyrosyi protein kinase. We find that casein kinase-1 can phosphorylate the p40 tyrosyl kinase on serine and threonine residues, in part on a unique tryptic peptide. The phosphorylation...
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