code: def _needle(fa, fb, needlefile, a, b, results):
      
      from Bio.Emboss.Applications import NeedleCommandline
  
      needle_cline = NeedleCommandline(asequence=fa, bsequence=fb,
                          gapopen=10, gapextend=0.5, outfile=needlefile)
      stdout, stderr = needle_cline()
      nh = NeedleHeader(needlefile)
      FileShredder([fa, fb, needlefile], verbose=False)
      r = ["\t".join((a, b, nh.identity, nh.score))]
  
      results.extend(r)
docs: Run single needle job