Initially, in vitro experiments were performed using mAbCD28 and its Fab fragments in two-way mixed lymphocyte reaction between Balb/c and C57BL mice.

• 根据体外MLR的结果，在课题的第二部分，我们研究了mAbCD28及其Fab片段在Wistar大鼠间以及SD-Wistar大鼠间甲状旁腺移植中的作用。