_pdbx_struct_chem_comp_feature.ordinal        1
    _pdbx_struct_chem_comp_feature.auth_comp_id   Q20
    _pdbx_struct_chem_comp_feature.auth_seq_id   10
    _pdbx_struct_chem_comp_feature.seq_num        .
    _pdbx_struct_chem_comp_feature.pdb_strand_id  Q
    _pdbx_struct_chem_comp_feature.asym_id        Q
    _pdbx_struct_chem_comp_feature.type           'SECONDARY STRUCTURE'
    _pdbx_struct_chem_comp_feature.details        'Helix of length 4 beginning at atom position C2A.'
      