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pertussis strain Tohama and stored in suspension in saline solution. However, they were not observed in the PT samples produced from stain CS and stored in powders. Carbamylation (Arg) on multiple sites (in S3, S4 and S5) was observed in the PT produced from 5th generation strain CS of B. pertussis. The high abundance ratio of carbamylation modification was potentially a negative effect on the detoxification of PT, since unmodified Lys was the active site for detoxification. The results obtained in this study provide information for mak