Amino acid sequence variation in duplicated SI genes and their relationship to other bacterial sequences. Multiple sequences were aligned using CLUSTALW. (A) NTP pyrophosphohydrolase (MutT) gene of V. vulnificus, strain YJ016 (VV1754, VV1786), strain CMCP6 (NP_761339.1); P. aeruginosa PA01 (NP_251870); S. pneumoniae, TIGR4 strain (NP_346216), R6 strain (NP_359201). (B) PAS gene of V. vulnificus YJ016 (VV1767, VV1806, VV1812, VV1854) and V. alginolyticus (AAC60476).