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Superfold
A superfold is defined as a protein fold which has been observed in three or more non-homologous proteins. There are nine superfolds which have been identified so far, including the beta trefoil and the jelly roll .
References
Protein superfamilies and domain superfolds.
Orengo CA, Jones DT, Thornton JM
Nature372p631-4(1994 Dec 15)
Orengo CA, Jones DT, Thornton JM
Nature372p631-4(1994 Dec 15)