Table 1.

Identity of A. thaliana SIG1, SIG2, and SIG3 to other factors in the σ⁷⁰ family in major conservative regions

σ factor subregion	Identity, %
	SIG1	SIG2	SIG3
Escherichia coli
2.1	50	42	25
2.3	61	44	56
2.4	55	45	27
4.2	57	43	57
Anabaena
2.1	58	50	29
2.3	78	61	67
2.4	55	64	18
4.2	61	43	57
Cyanidium caldarium
2.1	46	50	21
2.3	78	67	56
2.4	50	55	27
4.2	57	43	64

See Fig. 1 for sequences of the σ factors.