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Figure 4 | BMC Bioinformatics

Figure 4

From: Rigidity analysis of protein biological assemblies and periodic crystal structures

Figure 4

Matrices used to generate crystal structures from the asymmetric unit can assume one of several forms, based on the specific transformation that is required to reproduce the repeating crystal units. Depending on the combination of integer ±1 values on the diagonal (left), these can be either a rotation by 180° or a reflection. If a symmetry operation uses rotations with angles other than 180°, the matrix has the form shown on the right, with corresponding values of sin and cos substituted.

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