Heavy-atom site occupancy in the PDBx/mmCIF Dictionary
= Heavy-atom site occupancy in the PDBx/mmCIF Dictionary
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https://www.iucr.org/__data/iucr/cifdic_html/2/mmcif_pdbx.dic/Iphasing_MIR_der_site.occupancy.html
International Union of Crystallography dictionary item `_phasing_MIR_der_site.occupancy`: fraction of the atom type present at a heavy-atom site in a specified derivative.