sentences:  The isolated CTLs specific for the survivin protein after vaccination of the mice were used in cytoxicity assays where mice tumour cells expressing survivin were shown to be killed upon incubation with the specific CTLs.By using an oral DNA vaccine carried in an attenuated non-virulent form of Salmonella typhimurium, which co-encoded secretory chemokine CCL21 and survivin protein in C57BL/6J mice, Xiang "et al.