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Table 1 Statistical data on recognition sites of R-M systems of different types. Numbers of degenerate sites are shown in parenthesis

From: Lifespan of restriction-modification systems critically affects avoidance of their recognition sites in host genomes

Type of R-M system # of palindromic sites # of non-palindromic sites Total # of sites
I 5 (5) 171 (171) 176 (176)
Orthodox II 186 (93) 81 (23) 267 (116)
IIC/G 4 (4) 102 (57) 106 (61)
IIM 2 (2) 8 (7) 10 (9)
III 0 39 (8) 39 (8)
IV 2 (2) 1 (1) 3 (3)
Total 199 (106) 402 (267) 601 (373)