Telomerase activity assayed by TRAP ELISA was positive when the number of 293 cells examined was 10, 10 2,10 3, and 10 4. The A(formerly called OD) value depended on the number of 293 cells used in the assay.

• 293细胞端粒酶阳性，对10，102，103及104个细胞检测均为阳性，所测到的吸光度值（A，曾称光密度OD）依赖于被检293细胞数。