The advantage of constitutive expression vectors is that we need not feed mice with nisin, which makes the experiment on orally taken viccine in LAB more easily.

• pNZ8037能在乳酸乳球菌、乳酸杆菌、枯草芽孢杆菌等多种革兰氏阳性菌和大肠杆菌中稳定复制、存在,是一个广泛宿主范围的质粒。