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Amino acid alignment of AtCAO and CAO. Identical amino acids are indicated by lines between sequences. The top box is the Rieske binding site, the middle box is the mononuclear nonheme Fe-binding site, and the bottom box is the unique conserved site. The V274 that is converted to E in the ch1-2 allele is underlined, and the region with the double underline is deleted in ch1-3.
