NCTR Phototoxicity laboratory. The lab can simulate sunlight that matches any desired spectrum, such as specific latitude, season, or ozone concentration, thus, giving it the ability to simulate sunlight as it would appear anywhere on the planet. This technology is useful testing the effects of UV radiation exposure. The National Center for Toxicological Research (NCTR) is FDA's internationally recognized research center. The unique scientific research expertise of NCTR is critical in supporting FDA product centers and their regulatory science roles. NCTR, in partnership with researchers from government, academia, and industry, develops, refines, and applies current and emerging technologies to improve safety evaluations of FDA-regulated products.