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Catalytic residues of aaNAT2, aaNAT5b, paaNAT7, and SNAT (PDB code 1cjw). Parts of motifs A and B are shown in ribbons, colored cyan for aaNAT2, yellow for aaNAT5b, blue for paaNAT7, and green for SNAT. The residues involved in the enzyme catalysis in SNAT and the equivalent residues in other three mosquito (putative) aaNATs are shown as sticks, with red oxygen and blue nitrogen atoms. Carbon atoms and residue labels are shown using the same color scheme as for the ribbon presentations.
