Photographs
of a 23 day old transgenic frog tadpole. The green
light emitted from the pupil arises from the rods
in the back of the retina that are expressing
GFP under the control of the Xenopus opsin
promoter when fluorescence is excited by bright
blue light. The blue light is hidden by filters
that only allow green light to pass through to
the camera. The bottom image is a combination
of the upper pair of images. 
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