R-Phycoerythrin (R-PE or PE) is a highly stable and soluble fluorescent phycobiliprotein from red algae. Phycobiliproteins have exceptional fluorescence characteristics due to their biological role as light harvesters in cyanobacteria and certain algae. For this reason, phycobiliproteins like R-PE are commonly used to generate fluorescent probes through covalent conjugation to proteins and antibodies.
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