[3dem] Distribution of Electron Microscopy metadata in PDBx/mmCIF file format

[Justin Flatt]

At the beginning of October 2023, the Electron Microscopy Data Bank 
(EMDB) will start distributing electron microscopy (EM) metadata for its 
entries in PDBx/mmCIF file format alongside the already available XML 
formatted files. The addition of PDBx/mmCIF files in the archive will 
bring parity between EMDB and PDB (EM experimental data vs 3D 
structures) in the way metadata is served while improving the 
consistency and interoperability between the two archives. EMDB entries 
released before October 2023 will have PDBx/mmCIF files added at a later 
date. The description of PDBx/mmCIF categories and items featured in EM 
metadata files can be found in the PDBx/mmCIF dictionary 
(https://urldefense.com/v3/__https://mmcif.wwpdb.org/dictionaries/mmcif_pdbx_v50.dic/Groups/em_group.html__;!!Mih3wA!H0K0mbiWqxoJ8iY7opuGwbv4ShCzUGt-hQaaPensMr9KYz8GN8ql5YeErIS-R7BKbXMK4oSJpESufg-vl2QsvUBa$ ). 
For an EMDB entry EMD-xxxxx, PDBx/mmCIF file name will be 
emd-xxxxx.cif.gz and it will be located in the entry's subfolder called 
metadata (EMD-xxxxx/metadata) in the wwPDB archive repositories:

  	* EMDB: https://urldefense.com/v3/__https://ftp.ebi.ac.uk/pub/databases/emdb/structures/__;!!Mih3wA!H0K0mbiWqxoJ8iY7opuGwbv4ShCzUGt-hQaaPensMr9KYz8GN8ql5YeErIS-R7BKbXMK4oSJpESufg-vl2MZpXLK$ 
  	* wwPDB: https://urldefense.com/v3/__https://files.wwpdb.org/pub/emdb/structures/__;!!Mih3wA!H0K0mbiWqxoJ8iY7opuGwbv4ShCzUGt-hQaaPensMr9KYz8GN8ql5YeErIS-R7BKbXMK4oSJpESufg-vlxGtwnjO$ 
  	* RCSB PDB (US): https://urldefense.com/v3/__https://files.rcsb.org/pub/emdb/structures/__;!!Mih3wA!H0K0mbiWqxoJ8iY7opuGwbv4ShCzUGt-hQaaPensMr9KYz8GN8ql5YeErIS-R7BKbXMK4oSJpESufg-vlzOCzSnJ$ 
  	* PDBe (UK): https://urldefense.com/v3/__https://ftp.ebi.ac.uk/pub/databases/emdb/structures/__;!!Mih3wA!H0K0mbiWqxoJ8iY7opuGwbv4ShCzUGt-hQaaPensMr9KYz8GN8ql5YeErIS-R7BKbXMK4oSJpESufg-vl2MZpXLK$ 
  	* PDBj (Japan): https://urldefense.com/v3/__https://files.pdbj.org/pub/emdb/structures/__;!!Mih3wA!H0K0mbiWqxoJ8iY7opuGwbv4ShCzUGt-hQaaPensMr9KYz8GN8ql5YeErIS-R7BKbXMK4oSJpESufg-vl1lvb4mi$ 
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