To make use of the MMPs Dr Tsien attaches his fluorescent dye, along with some positive charges, to one side of a small hairpin-shaped protein molecule.

• 为了利用这种基质金属蛋白酶，钱博士将他的荧光染料和一些正电荷一同连接在一个小的发夹形状的蛋白质分子的一端。