def list_species(model, seeds=None):
    """This function is deprecated."""
    seeds = None or []

    from ecell4_base.core import Species

    if not isinstance(seeds, list):
        seeds = list(seeds)

    expanded = model.expand([Species(serial) for serial in seeds])
    species_list = [sp.serial() for sp in expanded.list_species()]
    species_list = sorted(set(seeds + species_list))
    return species_list
This function is deprecated.