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A new scheme has been devised to represent viruses and other biological assemblies with regular noncrystallographic symmetry in the Protein Data Bank (PDB). The scheme describes existing and anticipated PDB entries of this type using generalized descriptions of deposited and experimental coordinate frames, symmetry and frame transformations. A simplified notation has been adopted to express the symmetry generation of assemblies from deposited coordinates and matrix operations describing thedoi:10.1107/s0907444908017393 pmid:18645236 pmcid:PMC2677383 fatcat:jw6vevz23nghdmc4i66634yqje