Class Problems

1. How do I obtain a list of all human DNA structures in the PDB that are not in complex with another molecule? [Hint]
   
2. Use CE to report on the structure versus sequence identity in a human deoxyhemoglobin
3. Report on the geometry found in the post-synaptic neurotoxin b
4. Which proteins contain a cyclic peptide of 12 residues or less and were refined to an
   R value of better than 20%? [hint]
5. How similar are the structures of ribonuclease A in different crystal forms? [Hint]