... structure [ 2–9 ,1 1–1 5,3 8–4 1,9 5–9 9,111],although the length of this domain is variable within the family. The final partial tree, the ÔSBD treeÕ, lacks the character of a tree consisting of two groups, ... Withregard to the Nostoc CGTase, it matches best the a-amylasefrom Streptomyces griseus, a representative of the a-amy-lases produced by streptomycetes. The positioning of aNostoc CGTase in the assumed ... separate evolution of this domain [30].This together with the findings of the present study indicatesa separate evolution of the domains C and E compared to the domains A and B. The recent introduction...