docs: def _retranslate(seq):
          '''
          Retranslates a nucleotide sequence following refinement.
          Input is a Pair sequence (basically a dict of MongoDB output).
          '''
          if len(seq['vdj_nt']) % 3 != 0:
              trunc = len(seq['vdj_nt']) % 3
              seq['vdj_nt'] = seq['vdj_nt'][:-trunc]
          seq['vdj_aa'] = Seq(seq['vdj_nt'], generic_dna).translate()