Fig 1. Sequences of the Hpn and Hpn-2 proteins of H. pylori strain B128 [27,28].

Histidine residues are highlighted in blue and Glutamine residues are in green. The triangle corresponds to the position at which Hpn is truncated in Hpn-∆C mutant and at which Hpn-2 is truncated in the Hpn-2∆C mutant. The black stars the positions at which the Hpn and Hpn-2 sequence are interrupted in the study of Seshadri et al. [29].