code: def make_variant_sequences_arg_parser(add_sequence_length_arg=False, **kwargs):
      
      parser = make_rna_reads_arg_parser(**kwargs)
      add_variant_sequence_args(
          parser=parser,
          add_sequence_length_arg=add_sequence_length_arg)
      return parser
docs: Parameters
      ----------
      add_sequence_length_arg : bool
          If True then add the `--cdna-sequence-length` argument. This may be
          omitted if the cDNA sequence length is inferred from a protein length.
  
      **kwargs : dict
          Passed directly to argparse.ArgumentParser
  
      Creates argparse.ArgumentParser instance with all of the options
      needed to translate each distinct cDNA sequence determined from
      variants & RNAseq.
  
      See `args.variant_sequences` for commandline parameters which aren't added
      in this module.