R-Phycoerythrin (R-PE) is an intensely bright phycobiliprotein isolated from newly identified red algae species exclusive to the coastal region of Taiwan. It exhibits extremely bright red-orange fluorescence with high quantum yields, and generates fluorescence signals far stronger than other commonly-seen organic and synthetic fluorophores. Home Algae's R-PE Labeling Kit is an SH-reactive labeling kit. Modified R-PE has maleimide groups that can conveniently conjugate with the SH groups of antibodies. The total conjugation time including incubation takes approximately 3 hours. The three kit sizes available can label up to 50µg, up to 100µg, and up to 1mg of antibody respectively.