Intra- and interchromosomal shuffling of vibrio genes. VV1, V. vulnificus chromosome 1; VV2, V. vulnificus chromosome 2; VC1, V. cholerae chromosome 1; VC2, V. cholerae chromosome 2. VP1, V. parahaemolyticus chromosome 1; VP2, V. parahaemolyticus chromosome 2. See text for details. A homologous block of genomic sequence is indicated by a line between chromosomes; recombination events are represented by crossed lines.