I haven't looked at the link yet, and I also saw it mentioned on CNN...........but, the gene for fluoresence (or is it phosphorescence?) from a jellyfish is used as a "marker" gene in genetic engineering. The transferred gene is transferred along with the fluorescence gene, so if the "product" glows, then they are sure that the gene was successfully transplanted. There must be people on the list who have more expertise and can explain it more coherently......Take care, Eric