BioVision's FluorLast? with DAPI & anti-fading agent 1, 4-Diazobicyclo-(2,2,2-octane (DABCO?) is an aqueous mounting medium for preserving fluorescence of tissue and cell smears. This unique formula prevents rapid photobleaching of FITC, Texas Red, AMCA, Alexa fluoro 488, Alexa fluoro 594, Cy dyes, tetramethyly rhodamine, and Redox. The fluorescence is retained during prolonged storage at 4oC in the dark. This mounting medium is fortified with DAPI, which is a counter-stain for DNA and can be used for in situ hybridization techniques or other methods where fluorescence of DNA staining is required. DAPI excites at 360 nm and emits at 460 nm, producing a blue fluorescence. RNA is also stained with DAPI.