After the genes were introduced into Escherichia coli, the clones expressing Fab fragments specific to the surface antigen of E. histolytica were screened and the product was purified.

• 通过抗原夹心膜法、间接荧光抗体试验等方法 ,筛选特异性表达抗溶组织内阿米巴滋养体表面抗原的重组人单克隆抗体Fab段的克隆 ,并纯化其表达产物。