def add_biodata_args(parser):
    """Add standard arguments for preparing biological data to a command line arg parser.
    """
    parser.add_argument("--genomes", help="Genomes to download",
                        action="append", default=[],
                        choices=["GRCh37", "hg19", "mm10", "mm9", "rn5", "canFam3", "dm3", "Zv9", "phix",
                                 "sacCer3", "xenTro3", "TAIR10", "WBcel235"])
    parser.add_argument("--aligners", help="Aligner indexes to download",
                        action="append", default=[],
                        choices=["bowtie", "bowtie2", "bwa", "novoalign", "star", "ucsc"])
    return parser