Will you settle for a microbe able to generate laser (that is, coherent) light? A modified kidney cell with some extra proteins crammed in can do just that. Researchers hope that, since the green light illuminates the inside of the cell as it projects outward, future doctors can modify a cell to see what's going on inside it, without even having to shine an outside light source on it. And it's just SO cool... (Is this what comic-book hero Green Lantern's cells look like?)
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