- protein is not expressed or cannot be purified
- crystals don't grow
- phases too bad
- model does not refine
- B-factor too high
- The FAQ of PDBwiki
- why is there a difference between the Rfactors from Refmac and Sfcheck?
- Coot: I get bizarre connectivity and other weirdness on reading files if your structure looks like this
- Conserved Waters: How to find waters that are conserved between two different PDB files of the same or similar structures.