1JN4:
reference: Cleavage of 3',5'-pyrophosphate-linked dinucleotides by ribonuclease A and angiogenin., Jardine AM, Leonidas DD, Jenkins JL, Park C, Raines RT, Acharya KR, Shapiro R, Biochemistry 2001 Aug 28;40(34):10262-72. PMID: 11513604

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