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Motifs: Super Secondary structure. Beta Meander. Beta Hairpin ( β -turn, tight turn). Greek Key. Beta Sandwich. Beta Crossover. (a) Right handed. (b) Left handed. Beta Barrel. Beta-Alpha-Beta ( βαβ ). Beta-alpha-beta, αβ - barrel. Four helix Bundle. Coiled Coil. Helix-loop-helix.
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