Jelly Roll Protein

This is a "Jelly Roll" protein. Not a protein found in Jelly Rolls, but a kind of protein fold:
http://en.wikipedia.org/wiki/Beta_barrel#Jelly_roll
This one is based on PDB structure 2QZ3, a "family 11 glycoside hydrolase", aka, xylanase:
http://www.rcsb.org/pdb/explore.do?structureId=2qz3
STL file created using VMD:
http://www.ks.uiuc.edu/Research/vmd/
The protein backbone is represented in "cartoon" form.