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Cartoon structures of proteins that cover the seven structural classes defined in the SCOP database. Panel a shows structure of protein with PDB identifier 1mty, b for 1a8d, c for 2f62, d for 2bf5, e for 1vqq, f for 1u7g, and g for 4hir. Helices are shown in light grey, coils in dark gray, and strands in black.
