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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
