荧光素发光后转化成氧化荧光素，而后者不能发光。
They emit light and are then converted into oxyluciferin, which cannot produce light.
为了克服这个难题，剑桥研究小组通过改造生物零件使得生物体可以产生重复利用氧化荧光素的酶。
To counter this, the Cambridge team found a way to engineer BioBricks that would enable organisms to produce enzymes to recycle oxyluciferin.
“基因包”里包含有经修饰过的基因，并且能够让生物体重复利用氧化荧光素，这种次级代谢产物还可以用于二次发光。
The package includes genetic modifications to enable organisms to recycle oxyluciferin, the by-product of the reaction that produces light.
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