R-phycoerythrin Labeling Kit-NH2 is for simple and rapid preparation of R-PE-labeled IgG. NH2-reactive R-PE (a component of this kit) has an activated ester group and can easily make a covalent bond with an amino group of the target molecule without any activation process. The filtration tube in this kit allows a quick buffer exchange and concentration of sample IgG solution. This kit contains all of the reagents necessary for R-PE labeling, including the Storage buffer for conjugates.