code: def five_resect(dna, n_bases):
      '''Remove bases from 5' end of top strand.
  
      :param dna: Sequence to resect.
      :type dna: coral.DNA
      :param n_bases: Number of bases cut back.
      :type n_bases: int
      :returns: DNA sequence resected at the 5' end by n_bases.
      :rtype: coral.DNA
  
      '''
      new_instance = dna.copy()
      if n_bases >= len(dna):
          new_instance.top.seq = ''.join(['-' for i in range(len(dna))])
      else:
          new_instance.top.seq = '-' * n_bases + str(dna)[n_bases:]
  
      new_instance = _remove_end_gaps(new_instance)
  
      return new_instancf five_resect(dna, n_bases):
      '''Remove bases from 5' end of top strand.
  
      :param dna: Sequence to resect.
      :type dna: coral.DNA
      :param n_bases: Number of bases cut back.
      :type n_bases: int
      :returns: DNA sequence resected at the 5' end by n_bases.
      :rtype: coral.DNA
  
      '''
      new_instance = dna.copy()
      if n_bases >= len(dna):
          new_instance.top.seq = ''.join(['-' for i in range(len(dna))])
      else:
          new_instance.top.seq = '-' * n_bases + str(dna)[n_bases:]
  
      new_instance = _remove_end_gaps(new_instance)
  
      return new_instance
docs: Remove bases from 5' end of top strand.
  
      :param dna: Sequence to resect.
      :type dna: coral.DNA
      :param n_bases: Number of bases cut back.
      :type n_bases: int
      :returns: DNA sequence resected at the 5' end by n_bases.
      :rtype: coral.DNA