4WFC:
reference: The exosome-binding factors Rrp6 and Rrp47 form a composite surface for recruiting the Mtr4 helicase., Schuch B, Feigenbutz M, Makino DL, Falk S, Basquin C, Mitchell P, Conti E, EMBO J. 2014 Oct 15. pii: e201488757. PMID: 25319414

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