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Solvent-accessible surface and ribbon representations of the β2m hexamer. (a) The hexamer is shown with a view down the threefold rotational axis. Subunits are alternately colored green and blue. (b,c) Two orthogonal side-on views show each of the two intersubunit interfaces, which we refer to as strand-strand (intrasheet; b) and sheet-sheet (intersheet; c), respectively.
