| 
 Highlights the stacking of U-1 in the twister ribozyme | 
 
 
 Unit cell of twister (PDB ID: 4OJI), viewed along the 6-fold symmetry axis 
 | 
| 
 Unit cell of twister (PDB ID: 4OJI) showing twelve asymmetric units in a unit cell. | 
 
 
 
 
 glmS ribozyme depicted with Glucosamine-6-phosphate in the active site | 
 
      


