Table 1.

Summary of full-length solitary REs from prokaryotic genomes

Type of solitary RE	Probably truncated REs	REs that are parts of putative-separated R-M systems	REs with nearby location of corrupted MTase genes	REs for which no predicted paired MTases were found	REs without orthologs in other genomes	Total
I	79	38 (3)a	29 (17)	10 (7)	3 (3)	159
II	16	19 (6)	11 (10)	21 (10)	7 (7)	74
III	4	0	34 (13)	1 (1)	0	39
Total	99	57 (9)	74 (39)	32 (18)	10 (10)	272

^aThe numbers in parentheses indicate the number of groups of orthologous REs.