Table 1. Classification and distribution of LXG toxin and antitoxin genes in B. subtilis strains^a).

groups	YeeF				YobL		C	YqcG			YwqJ						YxiD		G			H	I	J	K	L	M	N	O	P	Q
subgroups	1	2	3	4	1	2		1	2	3	1	2	3	4	5	6	1	2	1	2	3
B.subtilis subsp. globigii ATCC 49760					●											●										●
B.subtilis subsp. spizizenii TU-B-10									●						●				◯			●					●
B.subtilis subsp. spizizenii str. W23				●											●			●
B.subtilis subsp. subtilis str. RO-NN-1			●				●		●					●						●											●
B.subtilis subsp. natto BEST195		●			●		●			●		●							◯				●	▲
B.subtilis subsp. subtilis str. BAB-1			●		●																●								●	●
B.subtilis HJ5			●		●							●									●								●
B.subtilis XF-1			●		●								◯								◯								●
B.subtilis TO-A	●				●			●					●				●								●
B.subtilis subsp. subtilis str. NCIB 3610	●				●	●		●			●						●						●
B.subtilis subsp. subtilis str. OH 131.1														●			●										●
B.subtilis BSn5								●					●														●	●
B.subtilis subsp. subtilis str. BSP1			●		●								●											●						●

^a) ●, LXG toxin and antitoxin genes; ▲, 2 copies of LXG toxin and antitoxin genes; ◯, orphan LXG toxin genes. See S1 Table for detailed results.