Primary structure, expression, and signal-dependent tyrosine phosphorylation of a Drosophila homolog of extracellular signal-regulated kinase.


The extracellular signal-regulated kinases (ERKs) comprise a class of protein-serine/threonine kinases that are activated in response to a wide variety of extracellular signals transduced via receptor tyrosine kinases. Activation of the ERKs requires both threonine and tyrosine phosphorylation suggestive of a key role in mediating intracellular events in… (More)


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