def METHOD_NAME():
    """TODO."""
    # human genes from https://biomart.genenames.org/martform
    # mouse genes from http://www.ensembl.org/biomart/martview
    # antibodies from https://www.biolegend.com/en-us/totalseq
    nb_url = "https://github.com/theislab/scvelo_notebooks/raw/master/"
    filename = "data/biomart/mart_export_human.txt"
    df = load(filename, sep="\t", backup_url=f"{nb_url}{filename}")
    df.columns = ["ensembl", "gene name"]
    df.index = df.pop("ensembl")
    filename = "data/biomart/mart_export_mouse.txt"
    df2 = load(filename, sep="\t", backup_url=f"{nb_url}{filename}")
    df2.columns = ["ensembl", "gene name"]
    df2.index = df2.pop("ensembl")
    df = pd.concat([df, df2])
    df = df.drop_duplicates()
    return df