Differences in the transcription of CHAP domain-containing genes after the induction of competence. The genes ZY05719_04700 and ZY05719_10700 were significantly enriched by XIP induction. ZY05719_00195 and ZY05719_09810 exhibited no relationship with competence. The data were normalized to the transcription of the housekeeping gene parC. The relative expression levels are presented as the means ± SDs from three biological repeats (***P < 0.01).