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Ayn Rand Quote Bumper Sticker
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In Life, Are You The Enzyme Or The Substrate? Mug
No need to be a biologist or biochemist to enjoy wry scientific humor with any of these gifts featuring the induced-fit enzyme-substrate model. Educational science attitude gifts with the ubiquitous query that will truly make others guess what you mean: "In Life, Are You The Enzyme Or The Substrate?" Unforgettable geek humor gifts for all who know about the difference between the enzyme and the substrate!