Repeat polymorphisms in VNTR loci aligned from the sequenced genomes of B. abortus , B. melitensis and B. suis . The sequences of the repeat region and flanking DNAs are shown for the eight variable loci. A red box designates a complete copy of the "AGGGCAGT" repeat; a red box containing a "g" designates the alternative repeat sequence "g GGGCAGT"; a red box containing an "a" designates the alternative repeat sequence "Aa GGCAGT"; a red box containing a "+A" designates the alternative 9-bp repeat sequence "a AGGGCAGT"; and yellow boxes enclose partial repeat units. The blue lines indicate sequence identity. The individual sequences are labeled "ab" for B. abortus strain 9–941; "mel" for B. melitensis strain 16M; and "suis" for B. suis strain 1330.