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In page Casimir Funk:

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After reading an article by Christiaan Eijkman that indicated that persons who ate brown rice were less vulnerable to beri-beri than those who ate only the fully milled product, Funk tried to isolate the substance responsible, and he succeeded. Because that substance contained an amine group, he called it "vitamine". It was later to be known as vitamin B3 (niacin), although he thought it would be thiamine (vitamin B1) and described it as "anti-beri-beri-factor".[citation needed]