Using stem cell technology, reproductive scientists in Texas, led by Dr. Richard r. Berhringer at the M.D. Anderson Cancer Center, have produced male and female mice from two fathers.

使用干细胞技术，由richard r . Berhringer博士带领的德克萨斯州M.D.A nderson肿瘤中心的生殖科学家们利用两只公鼠成功繁殖出雌性和雄性老鼠后代。

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This has substantially increased the difficulty of R&D, led to soaring R&D costs, and finally threatened the progress of the whole project.

这就为研发增添了不少困难，导致研发成本上涨，最终威胁到整个项目的进度。

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The Institute Committee, led by PDG. R. T. Arasu have been working very hard in making arrangements to welcome you and to ensure that you feel comfortable.

这个研习会的委员会是由前总监阿拉苏所领导，他一直在努力的筹备欢迎你们并期使你们觉得舒适。

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John McCain, R-Arizona, and Phil Gramm, R-Texas, who led the charge against the largely Democratic measure, said those safety standards would delay Mexican truck access to the United States for two years.

CNN: truck

Well, the study's authors--led by Robert R.

FORBES: Presidential Portfolios

Thirty-eight House Republicans, led by Representative Jennifer Dunn, R-Washington, have also written Bush, urging him to support the research.

CNN: Bush said to be 'struggling' with stem cell decision