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U.S. National Committee for Crystallography (USNC/Cr)

The National Academy of Sciences withdrew as the U.S. adhering member of the International Union for Crystallography (IUCr), effective January 1, 2026, and no longer serves as the U.S. adhering body to the Union. As a result, the U.S. National Committee for Crystallography (USNC/Cr) has been dissolved. This page is retained for historical purposes and reflects the National Academy of Sciences’ former relationship with the International Union for Crystallography.

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