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Overview of pilus gene clusters found in the sequenced C. diphtheriae strains in relation to the reference strain C. diphtheriae NCTC 13129. Homologous pilin genes are indicated by color; sortase genes are shown in dark gray. Genes encoding hypothetical proteins in the pilus gene cluster of C. diphtheriae PW8 are shown in light gray; mobile elements are labeled in yellow. Genes similar to SpaD and SpaH types are denoted with primes. Asterisks and hatched arrows indicate fragmented genes.
