Univalent antibody fragments, such as single chain variable fragment (ScFv), do not cross-link AChR molecules or bind complement, and therefore do not cause AChR loss;

• 由抗AChR MIR抗体制备的单链抗体（single chain variable fragment, ScFv）做为单价片段既不与AChR交叉结合，也不引起补体经典途径的激活，因此不会引起AChR的丢失。