[ccp4bb] Looking for used lN2-based cryosystem

Hi, Is any lab wanting to divest themselves of a functioning cryosystem for crystallography? We are looking for a liquid N2-based system (preferably in North America for reasons of shipping). If you have one, please email: 1. System details 2. Current condition 3. Suggested cost Thanks,

Re: [ccp4bb] Comparison of Water Positions across PDBs

In PDB format files, each polymer is assigned a unique chain ID. Chain IDs for all bound moieties and waters are assigned based on their proximity (number of contacts) to the nearest polymer. Once the polymers and non-polymer residues associated with them are assigned chain IDs, they are also a