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Content of amino acid residues on the molecular surface of PSAT dimers. Black bars represent negatively charged residues (Asp and Glu); white bars, positively charged residues (Arg and Lys); dark gray bars, polar uncharged residues (Asn, Gln, His, Ser, and Thr); light gray bars, hydrophobic residues (Ala, Gly, Ile, Leu, Phe, Pro, and Val).
