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Amino acid sequence alignment of three polyphenol oxidases (PPOs) in C. sinensis and other plant PPOs. The region corresponding to the chloroplast transit peptide is boxed, and the thylakoid peptidase-processing site is indicated by ▲. The three domains: red underline, tyrosinase domain; blue underline, PPO1_DWL domain; yellow underline, PPO1_KFDV domain. The green box refers to the CuA binding site; the purple box to the CuB binding site.
