CCP4 (file format)

{{Short description|Electron density file format}}

{{No footnotes|date=July 2021}}

{{Infobox file format

| name = ccp4

| extension = .ccp4

| mime =

| owner =

| creatorcode =

| genre = electron density file

| container for =

| contained by =

| extended from =

| extended to =

}}

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