Helicobacter DNA 6 Helicobacter pylori 6 article 6 controlled study 6 nonhuman 6 Adenosine Triphosphatases 4 Bacteria (microorganisms) 4 Bacterial Proteins 4 Base Pair Mismatch 4 Binding Sites 4 DNA Repair 4 DNA repair 4 DNA structure 4 DNA, Bacterial 4 DNA-Binding Proteins 4 Humans 4 MutS DNA Mismatch-Binding Protein 4 Recombination, Genetic 4 bacterial protein 4 enzyme activity 4 genetic variability 4 human 4 mismatch repair 4 priority journal 4 protein MSH2 4 protein purification 4 sequence homology 4 Adult 2 Amino Acid Motifs 2