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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional manual representative

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beta barrels

beta meanders

beta duplicates or obligate multimers

beta sandwiches

beta complex topology

alpha arrays

alpha bundles

alpha superhelices

alpha duplicates or obligate multimers

alpha complex topology

a+b two layers

a+b three layers

a+b four layers

a+b complex topology

a+b duplicates or obligate multimers

a/b barrels

a/b three-layered sandwiches

mixed a+b and a/b

few secondary structure elements

extended segments