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Schematic drawing of the structure of the 5-bromo-4-chloro-3-indolyl derivative of α-d-mannose used to for MAD phasing. The axial 3-OH and the equatorial 4-OH of mannose used by lectins as a major factor for discriminating between mannose/glucose and galactose (axial 4-OH) (Elgavish & Shaanan, 1997 ▶) are numbered.
