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mitotic apparatus

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影响细胞增殖周期的因素有哪些？细胞增殖周期与许多医学问题密切相关，举例说明。

G1期细胞同S期细胞融合，则S期细胞，G1期细胞。G2期细胞同S期细胞融合，则S期细胞，G2期细胞。G1、S和G2期细胞分别同M期细胞融合，则G1、S及G2细胞均产生。

细胞周期中的引擎是_和____。

The Internet The Internet is a global (globe) system of computer networks to serve billions of users worldwide. The Internet has reshaped most___（41）(tradition) means of communication including telephone , music , film and television. This has given birth to new_（42）(develop) of mass media. Newspaper, book and other print publishing are_（43）(adapt) themselves to this new technology. The Internet has_（44）(enable) new forms of human communications such as online chatting and social networking. online shopping has_（45）(grow) rapidly for major stores and small traders. The business-to-business service on the Internet affects the supply chains across all_（46）(industry). The origins of the Internet date back to research in the 1960s. The project was to build_（47）(power) computer networks. It was supported by the US_（48）(govern ) in cooperation with private businesses. By the 1990s, the Internet was made a commercial _（49）(produce)and became popular worldwide. As of 2011, _（50）(near)a third of the Earth's population used the Internet. _.
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