000 Mutants, Compared to the Wild-Type Enzyme[a](#t0fn0){ref-type="table-fn"}    enzyme                               GOS yield[b](#t0fn0){ref-type="table-fn"}   structure **0** yield[c](#t0fn0){ref-type="table-fn"}   structure **00** yield[c](#t0fn0){ref-type="table-fn"}   structure **00** yield[