text: import subprocess
  from io import StringIO
  from Bio import SeqIO
  
  
  def getSequence(title, db='nt'):
      """
      @param title: A C{str} sequence title from a BLAST hit. Of the form
          'gi|63148399|gb|DQ011818.1| Description...'.
      @param db: the C{str} name of the BLAST database to search.
      @return: A C{SeqIO.read} instance.
      """
      titleId = title.split(' ', 1)[0]
      fasta = subprocess.check_output(
          ['blastdbcmd', '-entry', titleId, '-db', db]).decode('ascii')
      return SeqIO.read(StringIO(fasta), 'fasta')
  