TABLE 18.

Kingdom distribution of channel families: α-type (1.A), porins (1.B), and toxins (1.C)

Channel type	Distribution	No. of families	TC nos.
α-Type channels	Ubiquitous	3 (or 4)	1.A.1; 1.A.8; 1.A.11; (9.A.17)
	B	3	1.A.22; 1.A.23; 1.A.45
	B, A	1	1.A.23
	An	16	1.A.2–1.A.7; 1.A.9; 1.A.10; 1.A.12; 1.A.14; 1.A.21; 1.A.24; 1.A.25; 1.A.27; 1.A.44
	Animal viruses	1	1.A.19
	An, Y	1	1.A.15
	An, Pl	1	1.A.20
	Pl	3	1.A.17; 1.A.18; 1.A.26
	Y	1	1.A.16
α-Autolysins	B	6	1.A.28; 1.A.29; 1.A.31; 1.A.34; 1.A.41; 1.A.42
	Bacteriophages	13	1.A.28–1.A.30; 1.A.32–1.A.40; 1.A.43
β-Porins	B	25	1.B.1–7; 1.B.9–26
	E (organelles)	1	1.B.8
Protein toxins	B	12	1.C.1–3; 1.C.5; 1.C.7–1.C.14; 1.C.36
	B, Pl	1	1.C.4
	Y	1	1.C.6
	An	1	1.C.15
Peptide toxins	B	12	1.C.20–1.C.31
	An	8	1.C.16–1.C.19; 1.C.32–1.C.35
Total		86