1NJ8:
reference: The structural basis of cysteine aminoacylation of tRNAPro by prolyl-tRNA synthetases., Kamtekar S, Kennedy WD, Wang J, Stathopoulos C, Soll D, Steitz TA, Proc Natl Acad Sci U S A 2003 Feb 18;100(4):1673-8. PMID: 12578991

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