R-Phycoerythrin is widely used in biotechnology and medical research as a fluorescent marker. Its strong fluorescence makes it ideal for applications in flow cytometry, where it helps in the analysis and sorting of cells based on specific characteristics. It is also employed in fluorescence microscopy to visualize and study cellular structures and processes with high precision. Additionally, R-Phycoerythrin is utilized in immunoassays, such as ELISA, to detect and quantify target molecules by binding to antibodies and emitting a measurable fluorescent signal. Its compatibility with gel electrophoresis ensures its use in protein analysis, aiding in the identification and separation of proteins based on their size and charge.