4E89:
reference: Crystal structure of xenotropic murine leukaemia virus-related virus (XMRV) ribonuclease H., Kim JH, Kang S, Jung SK, Yu KR, Chung SJ, Chung BH, Erikson RL, Kim BY, Kim SJ, Biosci Rep. 2012 Oct 1;32(5):455-63. PMID: 22724525

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