code: def _reset_seq(self):
          
          exon_seq_list, five_ss_seq_list, three_ss_seq_list = self._fetch_seq()
          self.exon_seq = ''.join(exon_seq_list)
          self.three_prime_seq = three_ss_seq_list
          self.five_prime_seq =  five_ss_seq_list
          self._to_upper()
docs: Updates attributes for gene represented in the self.bed attribute.
  
          Sequences are always upper case.