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The binding of BT-Br with Human CAT. (a–d) The interaction between BT-Br (colored in cyan) and CAT in four chains. Key binding residues are shown as sticks (colored in light green). The 2Fo-Fc omit maps of BT-Br (contoured at 1.0σ) in each chain are also shown. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
