Word: riboflavin
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Dates: during 1950-1959
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...firefly's strange cold, yellow-green light. Not much is known about its complex chemistry but Dr. Strehler points out an extraordinary fact. The light that comes from luciferin has been analyzed spectroscopically and turns out to be very similar to the fluorescent glow given off by riboflavin (vitamin B2) when it is irradiated with invisible ultraviolet...