Phaser Crystallographic Software

Phaser is a program for phasing macromolecular crystal structures with maximum likelihood methods. It has been developed by Randy Read's group at the University of Cambridge and is available through the Phenix and CCP4 software suites, and directly from this site.

This website supersedes http://www-structmed.cimr.cam.ac.uk/phaser/ which is now obsolete (and redirects to this page). A copy of the obsolete website can be found at http://www-structmed.cimr.cam.ac.uk/phaser_obsolete/

Use the sidebar to navigate through the extensive documentation for Phaser.

Currently Supported Releases

Phaser-2.5.0 Under Construction

• Download with Phenix Package → Nightly Builds
• Full Documentation → Manual
• Quicklinks to Keywords → Keywords

Phaser-2.4.0

• Download with Phenix Latest Official Release (recommended) 1.7.3-928 (6 Dec 2011) → Phenix Downloads
• Full Documentation → Manual
• Quicklinks to Keywords → Keywords

Phaser-2.3.0

• Download with CCP4 6.2 Package → CCP4
• Full Documentation (static wiki as of 16th June 2011) → Manual
  • Quicklinks to Keywords → Keywords
• Bugfixes
  • Packing criteria incorrectly set for Phaser MR in CCP4i
    • A fixed interface is available from the ftp site and replaces the distributed interface in automated downloads from 3rd August 2011 onwards. → CCP4-6.2.0 interface bug
  • Released 32 bit binary occasionally aborts on 64 bit Linux
    • A fixed 32 bit binary is available from the ftp site and replaces the distributed binary in automated downloads from 19th October 2011 onwards. → CCP4-6.2.0 program bug.

Referencing Phaser

Citing crystallographic software in your paper is important for funding new software development. We rely on your citations to convince funding bodies that our software is being used.

If you solve a structure with Phaser, please cite

Phaser crystallographic software pdf

McCoy AJ, Grosse-Kunstleve RW, Adams PD, Winn MD, Storoni LC, Read RJ.

J. Appl. Cryst. (2007). 40, 658-674.