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OPS structure of B. abortus, B. melitensis, and B. suis (except biovar 2) showing the M and A elements of the block copolymer.11 The capping tetrasaccharide containing a single 1,3 linkage defines the M epitope. The relative length of the M and A segments defined by the number of repeats, x and z, varies between strains. In solution, the Z rotamer of the formamido residue is the most abundant rotamer.
