def METHOD_NAME(sequence, min_identity):
  blast_out = get_ncbi_pdb_blast(sequence=sequence)
  results = summarize_blast_output(blast_out=blast_out,
    min_identity=min_identity)
  ids = []
  for result in results :
    ids.extend([ pdb_chain_id[0].lower() for pdb_chain_id in result.all_ids ])
  return ids