code: def get_pdb_headers(prot: Protein, chain_id: int = 0) -> List[str]:
      pdb_headers: List[str] = []
  
      remark = prot.remark
      if remark is not None:
          pdb_headers.append(f"REMARK {remark}")
  
      parents = prot.parents
      parents_chain_index = prot.parents_chain_index
      if parents is not None and parents_chain_index is not None:
          parents = [
              p
              for i, p in zip(parents_chain_index, parents)
              if i == chain_id
          ]
  
      if parents is None or len(parents) == 0:
          parents = ["N/A"]
  
      pdb_headers.append(f"PARENT {' '.join(parents)}")
  
      return pdb_headers
  
file_path: transformers/src/transformers/models/esm/openfold_utils/protein.py
imports: import dataclasses
  import re
  import string
  from typing import Any, Dict, Iterator, List, Mapping, Optional, Sequence, Tuple
  import numpy
  from .None import residue_constants
label_desc: Use image node_id 2 for calling a global function with example usage: get_pdb_headers(prot, chain_id) and returns: pdb_headers