来自《耶鲁大学开放课程：生物医学工程探索 第6集 第6集》
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of the total number of genes in the human genome表达的是人类全部基因中的不同基因 -
and therefore if it's expressing these unique因此如果细胞表达的是 -
this unique set of genes.这组独特的基因 -
If I could find the unique set of proteins而我又能找到和这些基因对应的 -
that correspond to those genes这种独特的蛋白 -
I could define chemically what the cell is.我就能通过化学手段确认这是哪种细胞 -
It turns out that one of the places而事实证明 -
that's been very fruitful to look for proteins寻找能鉴别细胞种类的 -
that differ between cell populations特定蛋白的最佳位置 -
is on the surface of the cell.是在富含蛋白的细胞膜上 -
We talked about the cell membrane,我们讲过细胞膜 -
the plasma membrane separating the inside form the outside.这种质膜将细胞内外区分开