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Clostridium prophages. The genome of C. tetani prophage 3 (center) is aligned with B. subtilis prophage PBSX (top) and C. perfringens prophage phi3626 (bottom). Genes related at the protein sequence level are connected by shading. Putative gene functions are indicated, and the modular structure of the prophage genomes is indicated by a color code, as in Fig. 3. Two likely deletions in the head gene cluster of PBSX are marked by a delta symbol.
