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Figure 1
Allowed origin shifts. (a) An atom in P2 and its symmetrically equivalent copy in four unit cells. (b) The two atoms arbitrarily shifted and their symmetrically equivalent copies. The overall structure changes under crystal symmetry. (c) The two atoms shifted by the allowed origin shift ½, ½, 0. The overall structure is invariant under crystal symmetry.

Journal logoBIOLOGICAL
ISSN: 1399-0047
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