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—Groups of PurP defined by phylogenetic analysis and detail of the multiple alignment. (a) Unrooted maximum likelihood tree of PurP constructed with 154 amino acid sequences containing 399 sites, the model LG+G + I and bootstrap with 1,000 resamplings. Root placement is indicated. (b) Indels shared by PurPs I, II and IV that were used to root the phylogenetic tree of PurP shown in (a). Five PurPs of each group are represented in the alignment.
