code: def _get_variant_regions(items):
      
      return list(filter(lambda x: x is not None,
                         [tz.get_in(("config", "algorithm", "variant_regions"), data)
                          for data in items
                          if tz.get_in(["config", "algorithm", "coverage_interval"], data) != "genome"]))
docs: Retrieve variant regions defined in any of the input items.