A yellow-green fluorescent pigment produced by certain bacteria, particularly Pseudomonas aeruginosa.
From bacteria + fluorescein (a synthetic fluorescent dye). Discovered in the early 1900s when scientists identified the glowing properties of certain bacterial colonies.
The green glow from bacteriofluorescin is how hospitals can sometimes detect nasty Pseudomonas infections under UV light—it's like bacteria equipped their own identifying beacon!
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