standard / high
A permuted β-barrel with a Greek key motif 3654, σ = 1 2 3 6 5 4. Left part is a 3D synthetic view of such a protein. Right part is a schematic view
from above, looking down along the axis of the barrel.
Tran et al. BMC Genomics 2012 13(Suppl 2):S5 doi:10.1186/1471-2164-13-S2-S5