screening for GPF - (May/22/2012 )

Bioluminescence is completely different from fluorescence. Things that glow all by themselves are bioluminescent. There are several chemically distinct types of bioluminescence. I'd recommend you look at the literature on insect bioluminescence.

Some bioluminescent systems use fluorescent molecules to alter the color of the bioluminescence. GFP was isolated from a bioluminescent organism, where it converted blue light to green light.