Table 4:

Structural biology repositories.

Repository	Purpose	Substrate	Maximum size	Formats
PDB	Atomic coordinates and ensembles	Subcellular structures	Tens of MB	PDB, mmCIF
EMDB	3D reconstructions from processed EM data	Subcellular structure	GB	MRC, CCP4
EMPIAR	Electron microscopy raw and processed image data	Subcellular structures (single-particle cryo-EM, cryo-ET)	Tens of TB	TIFF, HDF5, MRC, MRCS, DM4, EER, IMAGIC, SPIDER, SCIPION, EMDB-SFF, AMIRA, STL, VTK, VTP, OBJ, AVI, JPEG, PNG, EMX, BLENDER, TXT
IRRMC	X-ray diffraction raw data	Subcellular structures	Hundreds of MB	Raw diffraction data formats
BMRB	NMR raw data	Subcellular structures	GB	CCPN, mmCIF, PDB, NMR-STAR, X-PLOR