更新时间：2007年12月22日12:22 关键字：265key
摘友：sun
Steinman, whose study is being published in the September issue of the Journal of Reproductive Medicine, said the reason seems to be an insulin-like growth factor, which has been positively linked to both height and twinning.
Insulin-like growth factor is a protein that is released from the liver in response to growth hormone. It increases the sensitivity of the ovaries to follicle stimulating hormone, thereby increasing ovulation, the study said.
"Any circumstance that affects the amount of available insulin-like growth factor so as to modify the sensitivity of the ovary to follicle-stimulating hormone appears to govern the rate of spontaneous twinning," Steinman said in a statement.
Previous studies have demonstrated that shorter people have significantly lower levels of this protein and that countries with taller women have higher rates of twinning compared to countries with shorter women.
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来源：http://edu.qq.com/a/20060928/000096.htm
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