Table 1. Transcription of the com T4SS is induced by DNA damage but recA expression is not.

Genotype tested	recA	comB8	comB9
Wild-type plus cipro	−1.9 (−1.1–−3.1)	3.5 (2.7–4.4)	4.3 (3.5–5.2)
ΔaddA	−1.7 (−1.1–−2.9)	5.5 (4.3–7)	6.6 (4.9–8.9)
ΔrecA	ND	1.2 (1.0–1.5)	1.4 (1.0–1.8)
ΔrecA plus cipro	ND	ND	1.2 (1.0–1.3)
comB4IE	ND	ND	3.1 (2.7–3.6)
ΔcomB10 ΔaddA	ND	1.6 (1.3–2)	2.1 (1.7–2.7)
ΔcomB10 plus cipro	ND	ND	1.1 (0.9–1.3)

The fold change in transcription (range) for the indicated gene was measured for cells of the indicated genotype by real-time PCR using the comparative method. ND: not done.