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Hello, We are trying to refine a structure using REFMAC and we are facing problem in refining the double conformations of a cysteine residue. One conformation is involved in formation of a disulfide linkage and other conformation is free. Is there any way to define the restraints so that both the conformations can be refined. With kind regards, Prasenjit -- Prasenjit Bhaumik, Ph.D. Protein Structure Section Macromolecular Crystallography Laboratory National Cancer Institute at Frederick 1050 Boyles Street, Building-539, Room-145 P.O. Box B, Frederick, MD-21702, USA Phone: 301-846-1974, Fax: 301-846-7101 E-mail: [log in to unmask] -------------------------------------------------