What is a .MMCIF file?
mmCIF stores large biological structures like proteins from the Protein Data Bank.
- Did you know
- mmCIF is now the main format of the Protein Data Bank, replacing the older PDB layout.
- mmCIF extends the Crystallographic Information File, the broader IUCr standard for sharing crystal-structure data, to handle huge biological molecules.
- Since 2019 the Protein Data Bank has required new crystallographic depositions in PDBx/mmCIF, cementing its place over the legacy PDB layout.
- What Analyser reads
- Open scientific, medical and engineering files: DICOM scans, NIfTI brain volumes, Garmin FIT/TCX activities, FITS astronomy frames, FASTA/FASTQ sequences, chemistry structures (MOL/SDF/MOL2/CIF/XYZ), Gerber/Excellon PCB data, SPICE netlists, EDF/BDF biosignals, JCAMP-DX spectra, SPSS/Stata/SAS datasets and VTK/ParaView meshes - metadata extracted entirely in-browser.
- Depth of analysis
- .MMCIF is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .MMCIF file
- Drag a .MMCIF file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.