英语语法分析

Objective To establish the method of alloantigen specific t lymphocyte clones.

目的建立抗原特异性T淋巴细胞克隆的方法。

Antibodies respond to the quaternary structure of proteins so their potential to cross-react with an alloantigen is very low.

抗体对蛋白质的四级结构产生应答，因此它们对同种异型抗原发生交叉反应的能力较弱。

Conclusion Oral administration of alloantigen can down-regulate the immune response to histocompatibility antigens, prolong the survival times of heart allografts.

结论：口服抗原可以引起受者对异基因抗原的特异性免疫反应降低，使受者的心脏移植存活期延长。