Just after vaccinia infects a cell, it expresses two viral proteins on the cellsurface, which marks the cell as infected.
牛痘刚感染一个细胞后，就在细胞表面显示出两个病毒蛋白，这表明细胞已经感染。
2
Angiotensin - (1-7) is a small peptide that binds to proteins on the surface of cells and prevents cell growth - but only if the cell is actively growing when the binding occurs.