Glow-in-the-dark pee

Next Generation: Souped-up Probiotics Pinpoint Cancer
Genetically engineered commensal bacteria help researchers detect cancer metastases in mouse livers.
http://www.the-scientist.com/?articles.view/articleNo/43100/title/Next-Generation–Souped-up-Probiotics-Pinpoint-Cancer/

This is a cool kind of biotechnology where you can actually see changes with your own eyes. Most of the experiments …