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铁路旅客运输的主要服务对象是，其次是、和。

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Dr. Becker et al. first identified and reported mouse stem cells in Nature in _________.

A. 1953
B. 1960
C. 1963
D. 1973

Takahashi K & Yamanaka S published their entitled "Induction of pluripotent stem cells from mouse embryonic and adult fibroblast cultures by defined factors" in Cell in _______.

A. 1996
B. 2000
C. 2006
D. 2010

In general, the conversion to iPSCs has been low. e.g., the rate at which somatic cells were reprogrammed into iPSCs in Yamanaka's original mouse study was __________%.

A. 0.01–0.05
B. 0.01–0.1
C. 0.01–0.25
D. 0.1–1

Based on well-accepted international criteria, human embryo can be cultured in vitro until _______ days.

A. 7
B. 10
C. 14
D. as long as you want