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Figure 1
Three categories of crystals. (a) Periodic case with identical unit cells. (b) Commensurate modulation. (c) Incommensurate modulation with harmonic modulation wave. Protein structure from PDB entry 2rro. This figure is reproduced from Porta et al. (2011BB19). The modulation here is kept simple for the purposes of instruction. Modulations can be complex and involve translations, rotations, variations in occupancies, subdomains and/or a combination.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 50| Part 4| August 2017| Pages 1200-1207
https://doi.org/10.1107/S1600576717007294
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