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Secondary structure representations of solenoid tandem-repeat proteins. From top left to bottom right (PDB identifiers in parenthesis): ARM-repeat protein β-catenin (2Z6H), HEAT-repeat protein PR65 (1B3U), Ankyrin-repeat protein gankyrin (1UOH), HEAT-repeat protein Importin-β (3ND2), leucine-rich repeat (LRR) protein Ribonuclease Inhibitor (1BNH), TPR protein RapI (4I1A), β-helical repeat protein carbonic anhydrase (1QRE).
