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Phylogenetic analysis of TtmHIJ AT domains and its homologs from type I PKSs that specify malonyl-CoA, methylmalonyl-CoA, methoxymalonyl-ACP, or isobutyryl-CoA. Cluster names and NCBI accession numbers for each of the AT domains are given in parentheses. The scale bar represents 0.1 amino acid substitution per position.
