The Nobel prize in Chemistry was awarded today to three guys who developed fluorescent proteins. This article provides a cool slideshow demonstrating many uses for this protein, along with a discussion of it's development. These fluorescent proteins have been used as markers, allowing biologists to figure out many critical biochemical pathways within cells. The mechanism by which ATP synthase (which we are currently discussing in class) leads to the production of ATP, for example, was elucidated using these markers. Check it out!
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