What is "hydroxystilbamidine"

n. A fluorescent dye that emits different frequencies of light when bound to DNA and RNA; it is also medicinally used as a trypanocide.

Hydroxystilbamidine (trade name FluoroGold) is a fluorescent dye that emits different frequencies of light when bound to DNA and RNA. It is used as a retrograde tracer for outlining neurons, and as a histochemical stain.