def METHOD_NAME():
    """
    Downloads the EMDB-5778 volume map and returns the file path.
    Structure of the capsaicin receptor, TRPV1, determined by single particle electron cryo-microscopy.
    This molecule exhibits C4 symmetry.
    :return: A 'Volume' instance.
    """
    file_path = fetch_data("emdb_5778.map")
    vol = Volume.load(file_path, symmetry_group="C4")
    return vol