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Five major types of H pylori strains that do not produce BabA
| babA gene | Status |
| Negative | Include babA/B chimeras |
| Present | Regulated by slipped strand repairing and the status is “off” (probably equal to babB/A chimeras) |
| Present | Lack a translation initiation codon (single case of babA1 in strain CCUG17875) |
| Present | Have a frameshift mutation(s) causing non-productive translation |
| Present | Without apparent mutations and without a hypothesis for the lack of expression |
