Green Flourescent Protein (GFP)

Below are two images of Green Fluorescent Protein, which was originally found in a species of  cold-water jellyfish and is now an essential tool for scientists and ravers alike.  It absorbs UV light and re-emits it as green.  It appears to be composed of two beta-sheet tubes, (red) which are rotated slightly with respect to each other and are not attached by any sort of molecular chain.  There is some alpha helix (blue) on the inside of the tubes; surely, this is also important.

The protein is shown as a cartoon (left) and with a surface mesh (right).

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