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Lei Feng has won Shi's admiration for making sacrifices to benefit others, which may come as a surprise considering the boy lives in a country where decades of market-oriented reform have resulted in an economic boom and the emergence of self-interest.

"The neural tube is the beginning of the brain and spinal cord, " said the study's lead investigator Lee Niswander, professor of pediatrics at the CU School of Medicine. "A defect in the mLin41 gene doesn't allow the tube to close because not enough neural progenitor cells are being made."

The four major websites that the report refers to are www.sina.com.cn, www.qq.com, www.people.com.cn and www.xinhuanet.com which provide Twitter-like microblogging services.

It' s unfair to accuse China of being a "selective stakeholder" who switches between the role of "elephant" or "ant" as it sees fit, rather than a "full stakeholder," said the official.

The Health Ministry said in a statement that it will strive to expand the project to cover every person with cataracts by the end of 2020.