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Native crystals of full-length RiAFP. (a) Initial needle clusters obtained using 25%(w/v) polyethylene glycol 3350, 0.1 M bis-tris pH 5.5, 0.2 M lithium sulfate. (b) Optimized crystals obtained using 23%(w/v) polyethylene glycol 3350, 0.1 M sodium acetate pH 4.0, 0.2 M ammonium sulfate.
