def get_unique_features_from_genomic_array_of_sets_iv(genomic_array_of_sets, iv):
    """Collapse genomic array of sets into a unique list of the values in that region"""
    all_values = set()
    for iv, values_in_iv in genomic_array_of_sets[iv].steps():
        all_values.update(values_in_iv)
    return all_values