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A: Overlay of our substrate analog cocrystal (SAC) crystal structure in blue with apoenzyme (APO) structure in beige, root means square deviation values: 0.358. B: Ω loop of SAC structure, which is tilted outward in the presence of SA U44069; Trp 54 and Lys 59 on the Ω loop are observed to undergo major configuration changes.
