From CCP4 wiki
main.html CCP4] user community wiki ("CCP4 wiki" in short) is meant to be a collection of crystallographic knowledge as discussed on the [http://www.ccp4.ac.uk/ccp4bb.php CCP4 mailing list] (CCP4BB), and elsewhere. It may contain information about anything relevant to protein crystallographers, whether methods-related ("what is the best program for purpose X?"), problem-oriented ("my crystals melt if I look at them"), or concerning hardware ("what is your opinion on robot X / computer Y?").
The general [[Topics]] include articles about [[Expression_and_Purification| protein expression and purification]],