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[[CCP4]] is a crystallographic program system, and can be downloaded from [http://www.ccp4.ac.uk/download.php].
It is free for academic use; the license is at [http://www.ccp4.ac.uk/ccp4license.php].
Documentation is at [http://www.ccp4.ac.uk/docs.php], and a mailing list (CCP4BB) is at [http://www.ccp4.ac.uk/ccp4bb.php].
== How to use this wiki ==