A faint green glow in seawater turned out to be the loudest idea in modern cell biology. From that glow came green fluorescent protein, or GFP, a compact barrel of amino acids that absorbs blue light and emits green, acting as a built‑in lamp for any protein it is fused to.The bold claim is this: GFP did more to change everyday lab work than many famous drugs. By wiring the GFP gene next to a prom...More