Merohedral NCI, Macromolecular Crystallography Laboratory, Synchrotron Radiation Research ANL Merohedral twinning is possible when lattice symmetry is higher than crystal symmetry (for macromolecules, without center of symmetry) crystal point group lattice symmetry (4/mmm) 3 > 321, 312, 6 > 622 (6/mmm) (6/mmm) (6/mmm) (m3m)
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