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The predicted 3D structures and the positive sites of NtCCD1a (used as amino acid reference). The models were built with SWISS-MODEL and displayed with PyMOL software. The conserved four iron-ligating histidine (H) residues, and the conserved glutamates or aspartates (glycine in CCDL group) required for activity and positive sites were marked with yellow, blue, and red sphere, respectively.
