The CCP4 file format is file generated by the Collaborative Computational Project Number 4 in 1979. The file format for electron density has become industry standard in X-ray crystallography and Cryo-electron microscopy where the result of the technique is a three-dimensional grid of voxels each with a value corresponding to density of electrons (see wave function) The CCP4 format is supported by almost every molecular graphics suite that supports volumetric data. The major packages include:
Visual molecular dynamics PyMOL UCSF Chimera Bsoft Coot MOE
See also MTZ (file format) MRC (file format) EZD (file format) Chemical file format Protein Data Bank (file format) Voxel - one way of presenting 3D densities
External links Format technical details