Table 2. Restriction of phages by Eco94GmrSD endonuclease.

	PFU/ml on T7 Express [pET21]a	PFU/ml on T7 Express [pET21-gmrSD]a	How many fold of restriction by GmrSDb
T4	4.4 × 109 (±0.3 × 109)	3.0 × 108 (±0.2 × 108)	15-fold
T4gt	4.2 × 109 (±0.3 × 109)	2.1 × 108 (±0.2 × 108)	20-fold
T4 Δip1 (IPI*-deficient)	2.2 × 109 (±0.2 × 109)	Less than 103 (No plaque at 100-fold dilution)	More than 106-fold
λvir	2.8 × 109 (±0.4 × 109)	3.0 × 109 (±0.4 × 109)	No restriction
T4 eG192 (IPII− IPIII−)	5.8 × 109 (±0.2 × 109)	2.7 × 108 (±0.5 × 108)	21-fold
a.PFU/ml are average of three plating numbers (SD± is shown in parenthesis).
b.Ratio of PFU/ml on vector strain and Eco94GmrSD expressing host.