Two kinds of bacteria are employed in the work: bacteria that have incorporated a plasmid containing ECFP (Enhanced Cyan Fluorescent Protein) and bacteria that have incorporated a plasmid containing EYFP (Enhanced Yellow Fluorescent Protein). ECFP and EYFP are GFP (Green Fluorescent Protein) mutants with altered spectral properties. The ECFP bacteria contain the synthetic gene, while the EYFP bacteria do not. These fluorescent bacteria emit cyan and yellow light when exposed to UV radiation (302 nm). As they make contact with each other plasmid conjugal transfer takes place and we start to see color combinations, possibly giving rise to green bacteria. Photo: Clontech


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