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The beautiful structure of the Green Fluorescent Protein (GFP), one of the most widely used proteins in biochemical research. The picture illustrates the principle of GFP in that the green fluorescent emission is induced by blue light excitation. The chromophore is represented by spacefill atoms while the beta barrel is represented by thin ribbons. The texture of the ribbons is a straight copy and paste from the Moray texture library. For the simulation of the light, the POVRay media statement was used again. This effect is hard to get working properly and takes a lot of number crunching, but the ambience it generates is very nice indeed!