DM-Nitrophen is a Ca2+ cage. DM-Nitrophen releases Ca2+ when cleaved upon illumination with near-ultraviolet light.
References:
[1]. Ellis-Davies GC, et, al. Laser photolysis of caged calcium: rates of calcium release by nitrophenyl-EGTA and DM-nitrophen. Biophys J. 1996 Feb;70(2):1006-16.
















