code: def to_dict(self):
          
          return dict(
              reference_name=self.reference_name,
              annotation_name=self.annotation_name,
              annotation_version=self.annotation_version,
              gtf_path_or_url=self._gtf_path_or_url,
              transcript_fasta_paths_or_urls=self._transcript_fasta_paths_or_urls,
              protein_fasta_paths_or_urls=self._protein_fasta_paths_or_urls,
              decompress_on_download=self.decompress_on_download,
              copy_local_files_to_cache=self.copy_local_files_to_cache,
              cache_directory_path=self.cache_directory_path)
docs: Returns a dictionary of the essential fields of this Genome.