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Caffeine crystals

Annie Cavanagh

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Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
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Creative Commons Attribution Non-Commercial (CC BY-NC 4.0) terms and conditions https://creativecommons.org/licenses/by-nc/4.0

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Description

False-coloured scanning electron micrograph of caffeine crystals. Caffeine is a bitter, crystalline xanthine alkaloid that acts as a stimulant drug. Beverages containing caffeine, such as coffee, tea, soft drinks, and energy drinks, enjoy great popularity, and 90% of adults consume caffeine daily. Wellcome Image Awards 2012.

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