Data items in the PDBX_CHEM_COMP_ATOM_FEATURE category provide a selected list of atom level features for the chemical component.
loop_ _pdbx_chem_comp_atom_feature.comp_id _pdbx_chem_comp_atom_feature.atom_id _pdbx_chem_comp_atom_feature.feature_type 'LYS' 'N' NT 'LYS' 'C' CT 'LYS' 'CA' CPA