RFP (Red Fluorescent Protein), cloned from Discosoma coral (DsRed, DsRed2 or drFP583), is a protein which exhibits bright red fluorescence when exposed to blue light. It is common research practice for biologists to introduce a gene (or a gene chimera) encoding an engineered fluorescent protein into living cells and subsequently visualize the location and dynamics of the gene product using fluorescence microscopy.