Amino acid sequences of SDHs encoded by aroE genes from five H. pylori strains were aligned. Sequences from L1675, PG139, PG233, and PG156 are presented in this study. The 26695 sequence was taken from a public database. GenBank accession numbers for sequences presented here are as follows: L1675, EU939307; PG139, EU939304; PG233, EU939305; and PG156, EU939306. Identical nucleotides are indicated by dots. Sequence alignment was performed using the CLUSTALW program within DDBJ.