loop_ _pdbx_nmr_ensemble.entry_id _pdbx_nmr_ensemble.conformers_calculated_total_number _pdbx_nmr_ensemble.conformers_submitted_total_number _pdbx_nmr_ensemble.conformer_selection_criteria _pdbx_nmr_ensemble.representative_conformer 1ABC 40 20 'structures with the least restraint violations' 1