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assay: a review on an apoptosis detection system based on phosphatidylserine exposure. Cytometry 1998, 31:1–9.PubMedCrossRef 47. Giannouli M, Antunes LCS, Marchetti V, Triassi M, Visca P, Zarrilli R: Virulence-related traits of epidemic Acinetobacter baumannii strains belonging to the international clonal Histidine ammonia-lyase lineages I-III and to the emerging genotypes ST25 and ST78. BMC Infect Dis 2013, 13:282.PubMedCentralPubMedCrossRef 48. Cover TL, Krishna US, Israel DA, Peek RM Jr: Induction of gastric epithelial cell apoptosis by Helicobacter pylori vacuolating cytotoxin. Cancer Res 2003, 63:951–957.PubMed Competing interests The authors declare that they have no competing interests. Authors’ contributions Conceived and designed the experiments: MG, GR, MR, VRI, RZ. Performed the experiments: MG, ATP, VRU. Analyzed the data: MG, GR, MR, MT, RZ. Wrote the manuscript: MG, VRI, RZ. All authors read and approved the final manuscript.