Is BrdU (Bromodeoxyuridine) light sensitive?

Yes, BrdU (Bromodeoxyuridine) is light sensitive. During cell proliferation assays, BrdU should be added in the dark. Incubations also must be in a dark environment. This is because cells pulsed with BrdU may be photosensitive. To preserve the integrity of BrdU, it must be stored at +2 to +8°C and protected from light in storage.