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Incubation of a partially purified protein tyrosine kinase from rat lung with Mg 2+ and ATP resulted in about 10-15-fold activation of the enzyme activity as judged by the phosphorylation of poly(Glu:Tyr,4:1), an exogenous substrate. The activation was time dependent and was associated with the phosphorylation of a single protein band of 50 kDa. Phosphoamino acid analysis of the phosphorylated...
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