TABLE 2.

Organismal types and average sizes of the 12 phylogenetic clusters of the AT-2 family

Cluster	Proteobacterial subcategory represented	Avg size of proteins ± SDa
1a	β	789 ± 445
1b	γ (clostridia)	911 ± 667
1c	α, γ	285 ± 179
1d	β	3,068
2a	α	1,271 ± 907
2b	γ	266 ± 42
2c	β, γ (E. coli phage)	422 ± 118
2d	γ	288
3a	γ	452
3b	β, γ (clostridia)	1,468 ± 992
3c	γ	1,029 ± 1,113
3d	γ	448 ± 70

^aAverage size of the proteins in a cluster is given in terms of numbers of amino acyl residues.