loop_
        _ma_poly_residue_feature.ordinal_id
        _ma_poly_residue_feature.feature_id
        _ma_poly_residue_feature.label_asym_id
        _ma_poly_residue_feature.label_seq_id
        _ma_poly_residue_feature.label_comp_id
          1  1  A   17  LYS   
          2  2  A  206  LYS  
          3  3  B   38  THR   
          4  4  B  400  LEU  
          5  5  C  429  GLN  
          6  6  C  461  LEU  
          7  7  C  735  ASP  
          8  8  C  865  SER  
         # ...  abbreviated ...