B7-2/CD28 expression in renal allograft recipients when acute rejection happens  
Shi Li-hua1, 2, Li Ying2, Li Hui2, Sun Guang1
Chinese Journal of Tissue Engineering Research . 2012, (18): 3290 -3294 .  DOI: 10.3969/j.issn.1673-8225.2012.18.014