4K2R:
reference: Structural basis for activation of ZAP-70 by phosphorylation of the SH2-kinase linker., Yan Q, Barros T, Visperas PR, Deindl S, Kadlecek TA, Weiss A, Kuriyan J, Mol Cell Biol. 2013 Mar 25. PMID: 23530057

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