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Overall structures of 4 Fabs. (A) B4 with HC in red and LC in blue. (B)-(D) Overlaps of 6 B13 (B), 2 B4* (C) and 4 B13* (D) Fabs in the crystallographic asymmetric units. Superimpositions are based on the variable domains only. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
