Objective to explore the optimal condition of direct differentiation into dopaminergic neurons of embryonic stem cells in serum-free and feeder layer cell free medium.

目的寻求无血清、无饲养层细胞存在的情况下，胚胎干细胞向多巴胺能神经元定向诱导分化的最佳条件。

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METHODS Xenopus leavis females were injected with HCG, eggs were harvested next morning and dejellied by 2% cysteine, from which the Xenopus leavis egg cell free translating system was prepared.

方法非洲爪蟾注射HCG催卵，2 %半胱氨酸去胶膜，高速离心制备卵提取物，即为非洲爪蟾卵非细胞翻译体系。

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A scientist showed that mouse leukemia could be transmitted by cell-free filtrates.

一位科学家发现小鼠白血病可以通过细胞游离滤液传播。

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It refers to usually 'receptors' that are fixed in a cell, on a cell membrane, and 'ligands' which are dispersed throughout the body and free to diffuse around, and occasionally will find the cell.

受体这个词通常代表了,固定于细胞表面的分子,而配体分散于体内各处,能够自由扩散,它们偶尔会与细胞邂逅

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It is a cell-free filtrate vaccine, which means it contains no dead or live bacteria in the preparation.

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Woman will receive, as before mentioned, a free cell phone and a very competitive salary.

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Red grapes are also high in other antioxidants called polyphenols that prevent cell damage from free radicals.

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