Data items in the ATOM_SITES_ALT_GEN category record details about the interpretation of multiple conformations in the structure.
loop_ _atom_sites_alt_gen.ens_id _atom_sites_alt_gen.alt_id 'Ensemble 1-A' 1 'Ensemble 1-A' 2 'Ensemble 1-B' 1 'Ensemble 1-B' 4 'Ensemble 2-A' 2 'Ensemble 2-A' 3 'Ensemble 2-B' 2 'Ensemble 2-B' 4