2F9D:
reference: Crystal structure of a core spliceosomal protein interface., Schellenberg MJ, Edwards RA, Ritchie DB, Kent OA, Golas MM, Stark H, Luhrmann R, Glover JN, Macmillan AM, Proc Natl Acad Sci U S A. 2006 Jan 31;103(5):1266-71. Epub 2006 Jan 23. PMID: 16432215

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