def feature_label_to_taxon(s: str) -> str:
    """
    input: 'X; x__AAA; x__BBB; x__CCC; x__DDD; x__EEE; x__FFF; x__GGG'
    output: 'AAA|BBB|CCC|DDD|EEE|FFF|GGG'
    """
    items = s.split('; ')[1:]
    return '|'.join(i[3:] for i in items)