The factors that influence real estate cycle fluctuation can be divided into endogenous and exogenous factors. Each of factors provided the influence by its mechanism.
影响房地产周期因素可以分为内生因素和外生因素，各类因素通过各自机制影响着房地产周期运行。
2
Conclusions: Transfecting the exogenous FHIT gene into gastric cancer cells can suppress the proliferation of tumor cells, and can also induce apoptosis and cell cycle arrest.
结论：向胃癌细胞中导入外源性FHIT基因可以抑制肿瘤细胞增殖，诱导细胞凋亡并引起细胞生长周期阻滞。
3
Highly conserved DNA-repair and cell-cycle checkpoint pathways allow cells to deal with both endogenous and exogenous sources of DNA damage.