2674270 DCFDA 2',7'-dichlorofluorescein diacetate 342 2674275 DCF-DA 5-(and-6)-carboxy-2',7'-dichlorofluorescin diacetate 3 2674276 DCF-DA Dichlorofluorescin diacetate assay 1 2674277 DCF-DA dihydro derivative probes of fluorescein 1 2674278 DCF-DA dilation and fluorescence-associated free radical 1 2674279 DCF-DA oxidation-dependent fluorogen 2'-7' dichlorofluorescin diacetate 1