这个词是什么意思？
A fractionated cell extract that maintains a biological function. A subcellular fraction isolated by ultracentrifugation or other separation techniques must first be isolated so that a process can be studied free from all of the complex side reactions that occur in a cell. The cell-free system is therefore widely used in cell biology. (From Alberts et al., Molecular Biology of the Cell, 2d ed, p166)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002474 · MeSH 2026。
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