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Similarity comparison of amino acid sequences of CrtW ketolases from Paracoccus sp. strain N81106 (16) (NCBI accession number BAE47465), Brevundimonas sp. strain SD212 (21) (GenBank accession number AB181388), and Alcaligenes sp. (16) (NCBI accession number BAA09596). The four transmembrane domains and three conserved His motifs involved in iron binding are indicated. Highly conserved amino acids are in bold and underlined..
