Phaser Crystallographic Software

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Phaser is a program for phasing macromolecular crystal structures with maximum likelihood methods. It has been developed by Randy Read's group at the Cambridge Institute for Medical Research (CIMR) in the University of Cambridge and is available through the Phenix and CCP4 software suites.

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

This PhaserWiki supersedes the obsolete Phaser homepage, which now redirects to this wiki. A copy of the obsolete Phaser homepage can be found here

Currently Supported Releases


Download with Phenix Nightly Builds → Phenix
Download with CCP4 Nightly Builds → CCP4
Documentation → Manual


Download with Phenix Official Release 1.10 (September 2015) → Phenix
Download with CCP4 7.0 → CCP4
Documentation → Manual

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
McCoy AJ, Grosse-Kunstleve RW, Adams PD, Winn MD, Storoni LC, Read RJ.
J Appl Cryst (2007). 40, 658-674.