It turns out that one of the places that's been very fruitful to look for proteins that differ between cell populations is on the surface of the cell.

而事实证明,寻找能鉴别细胞种类的,特定蛋白的最佳位置,是在富含蛋白的细胞膜上

耶鲁公开课 - 生物医学工程探索课程节选