1KSW:
reference: Mutant tyrosine kinases with unnatural nucleotide specificity retain the structure and phospho-acceptor specificity of the wild-type enzyme., Witucki LA, Huang X, Shah K, Liu Y, Kyin S, Eck MJ, Shokat KM, Chem Biol 2002 Jan;9(1):25-33. PMID: 11841936

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