You could watch where it localizes in the cell, there are fluorescent assays you could use to determine what other proteins it interacts with.

你可以看到它在细胞的什么地方，你可以用荧光化验的办法确定,它和其它什么蛋白质相作用。

麻省理工公开课 - 化学原理课程节选

And once he did that, both he and many other scientists, could then, once they understood what caused the fluorescence, make little changes to the actual protein, and tune what the properties of that fluorescent protein were.

而且一旦他做成了这个，一旦他们弄清楚了是什么导致萤光，他和其它很多科学家，就可以对蛋白质做微小的改变，调节蛋白质的荧光性质。

麻省理工公开课 - 化学原理课程节选