2A4L:
reference: Inhibition of cyclin-dependent kinases by purine analogues: crystal structure of human cdk2 complexed with roscovitine., De Azevedo WF, Leclerc S, Meijer L, Havlicek L, Strnad M, Kim SH, Eur J Biochem. 1997 Jan 15;243(1-2):518-26. PMID: 9030780

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