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An augmented Bernal lattice: (a) a fragment of a Bernal lattice (large dots) is augmented with an additional pair of points along each edge (small dots). Vertices are selected (coloured) to represent the path of a protein chain (b) with helices on lattice edges and strands along lines connecting satellite points. Cα atom positions are marked by small spheres which are linked by a fine line. Points are coloured blue to red following the chain from its amino to carboxy terminus.
