Aminooxy CF™405S (aka CF405S hydroxylamine or CF405S aminooxyacetamide) is a blue fluorescent dye with an aminooxy reactive group, which can be used to label a target molecule with an aldehyde or ketone group. Aminooxy group readily reacts with an aldehyde or ketone group to form a stable linkage without the use of a reducing agent. CF™405S has an absorption peak wavelength that nearly coincides with the 405 nm blue diode laser line. In addition, the emission peak wavelength of the dye well centers within the blue detection window of BD flow cytometers. As a result, flow cytometry analysis using CF™405S dye results in much brighter signal than that using Alexa Fluor® 405.Compatible with the NucleoCounter® NC-3000™.