code: def run_mutect(job, tumor_bam, normal_bam, univ_options, mutect_options):
      
      # Get a list of chromosomes to handle
      if mutect_options['chromosomes']:
          chromosomes = mutect_options['chromosomes']
      else:
          chromosomes = sample_chromosomes(job, mutect_options['genome_fai'])
      perchrom_mutect = defaultdict()
      for chrom in chromosomes:
          perchrom_mutect[chrom] = job.addChildJobFn(
              run_mutect_perchrom, tumor_bam, normal_bam, univ_options, mutect_options, chrom,
              memory='6G', disk=PromisedRequirement(mutect_disk,
                                                    tumor_bam['tumor_dna_fix_pg_sorted.bam'],
                                                    normal_bam['normal_dna_fix_pg_sorted.bam'],
                                                    mutect_options['genome_fasta'],
                                                    mutect_options['dbsnp_vcf'],
                                                    mutect_options['cosmic_vcf'])).rv()
      return perchrom_mutect
docs: Spawn a MuTect job for each chromosome on the DNA bams.
  
      :param dict tumor_bam: Dict of bam and bai for tumor DNA-Seq
      :param dict normal_bam: Dict of bam and bai for normal DNA-Seq
      :param dict univ_options: Dict of universal options used by almost all tools
      :param dict mutect_options: Options specific to MuTect
      :return: Dict of results from running MuTect on every chromosome
               perchrom_mutect:
                   |- 'chr1': fsID
                   |- 'chr2' fsID
                   |
                   |-...
                   |
                   +- 'chrM': fsID
      :rtype: dict