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Kumar S: Inferring species phylogenies from multiple genes: concatenated sequence tree versus consensus gene tree. J Exp Zoolog B Mol Dev Evol 2005,304(1):64–74.CrossRef 42. Guindon S, Gascuel O: A simple, fast, and accurate algorithm to estimate large phylogenies by maximum likelihood. Syst Biol 2003,52(5):696–704.CrossRefPubMed 43. Keane TM, Creevey CJ, Pentony MM, Naughton TJ, McLnerney JO: Assessment of methods for amino acid matrix selection and their use on empirical data shows that ad hoc assumptions for choice of matrix are not justified. BMC Evol Biol 2006, 6:29–47.CrossRefPubMed Authors’ contributions mTOR inhibitor CGB carried out the physiological and molecular genetic studies and drafted the manuscript. MM carried out motility tests, analysed the proteomic data and helped to draft the manuscript. FBB performed the carbon fixation experiments. VK carried out the proteomic experiments. CL-G performed the mass spectrometry analyses. DL participated
in physiological analyses. PB and FA-P conceived of the study, participated in its design and coordination, and helped to draft the manuscript. All authors read and commented on the manuscript.”
“Background Helicobacter pylori may have infected humans since their origin and currently is believed to infect more than half the population in the world [1, 2].
Infection is usually acquired during childhood by intrafamilial transmission check details and in the majority of cases infection is lifelong unless eradication by antibiotic treatment is undertaken [3, 4]. The prevalence of H. pylori infection ranges from 25% in developed countries to more than 80% in the developing regions [3, 5, 6]. H. pylori is commonly transmitted from mother to child . H. pylori is well known for being highly diverse and recombining frequently. DNA sequence analysis of housekeeping and virulence associated genes all have illustrated the unusually high degree of genetic variability in this species [2, 7–12]. Comparison of isolates within a single host sampled over an average of 1.8 years has revealed that an average of ~100 DNA imports occur between bacteria, corresponding to 3% of the genome or 50 kb  and by extrapolation from these data, it was predicted that within 41 years half the genome would have been replaced by imports . In comparison, 10–100 million years were needed to replace 60% of the E. coli genome . Studies suggest that recombination is rare between isolates from different continents and as such H. pylori behaves like a genetic marker of human descent and reflects the human population in which the host spent his/her childhood [2, 10, 12].