与阴性对照组比较，阳性对照组和实验组细胞群体倍增时间增加。
Compared with negative control group, the doubling time of both positive control group and experimental groups was prolonged.
细胞群体倍增时间由第7代起显著延长（P<0.01）； MTT比色法的结果亦显示，第7代细胞的增殖能力开始大幅下降（P<0.01）。
Results Population doubling time of corneal stromal cells prolonged significantly since passage 7. MTT assay also showed cell viability of passage 7 decreased to 60% of passgage 1 (P< 0. 01 ).
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