Avoidance of recognition sites of restriction-modification systems is a widespread but not universal anti-restriction strategy of prokaryotic viruses

Table 2 Composition of the datasets used in this work

Dataset	Number of different sites	Number of different genomes	Number of (site, genome) pairs
Experimental dataset	494^a	2861^b	66,704
Control dataset 1	899	3407	3,062,893
Control dataset 2	899	4021	3,614,879

^aR-M systems encoded in the genomes of the known phage hosts recognize 494 among all 899 known RS. ^bOnly 2861 phages among 3407 have known host species with available data on the encoded R-M systems

ISSN: 1471-2164