code: def get_entity_info(pdb_id):
      
      out = get_info(pdb_id, url_root = 'http://www.rcsb.org/pdb/rest/getEntityInfo?structureId=')
      out = to_dict(out)
      return remove_at_sign( out['entityInfo']['PDB'] )
docs: Return pdb id information
  
      Parameters
      ----------
  
      pdb_id : string
          A 4 character string giving a pdb entry of interest
  
      Returns
      -------
  
      out : dict
          A dictionary containing a description the entry
  
      Examples
      --------
      >>> get_entity_info('4lza')
          {'Entity': {'@id': '1',
        '@type': 'protein',
        'Chain': [{'@id': 'A'}, {'@id': 'B'}]},
       'Method': {'@name': 'xray'},
       'bioAssemblies': '1',
       'release_date': 'Wed Aug 14 00:00:00 PDT 2013',
       'resolution': '1.84',
       'structureId': '4lza'}