code: def get_base_cnv_regions(data, work_dir, genome_default="transcripts1e4", include_gene_names=True):
      
      cov_interval = dd.get_coverage_interval(data)
      base_regions = get_sv_bed(data, include_gene_names=include_gene_names)
      # if we don't have a configured BED or regions to use for SV caling
      if not base_regions:
          # For genome calls, subset to regions near genes as targets
          if cov_interval == "genome":
              base_regions = get_sv_bed(data, genome_default, work_dir, include_gene_names=include_gene_names)
              if base_regions:
                  base_regions = remove_exclude_regions(base_regions, base_regions, [data])
          # Finally, default to the defined variant regions
          if not base_regions:
              base_regions = dd.get_variant_regions(data) or dd.get_sample_callable(data)
      return bedutils.clean_file(base_regions, data)
docs: Retrieve set of target regions for CNV analysis.
  
      Subsets to extended transcript regions for WGS experiments to avoid
      long runtimes.