Primary full text pmc.ncbi.nlm.nih.gov/articles/PMC2713992/ . Nature Immunology10,728–733(2009), DOI10.1038/ni.1755. Original byline Jin Wu, You-Qiang Wu, Daniel Ricklin, Bert J. C. Janssen, John D. Lambris and Piet Gros. Abstract and Fig.1d–e: recombinant FH(1–4), convertase decay and factor-I cleavage assays; C3b complex structure at2.7angstrom. PubMed published title includes complement fragment; author manuscript title omits those words.