2XQW:
reference: Dual interaction of factor H with C3d and glycosaminoglycans in host-nonhost discrimination by complement., Kajander T, Lehtinen MJ, Hyvarinen S, Bhattacharjee A, Leung E, Isenman DE, Meri S, Goldman A, Jokiranta TS, Proc Natl Acad Sci U S A. 2011 Feb 1. PMID: 21285368

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