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PonA1 domain composition and protein secondary structure assignment. (A) Functional domains of PonA1 protein. The analysis of PonA1 sequence was performed on the Pfam database (http://pfam.xfam.org/). (B) PonA1 sequence of the crystallized transpeptidase domain. The secondary structure elements are shown above the sequence. The stars below the sequence indicate the first and last residue that was observed in the structure of the crystallized PonA1 domain.
