BioArt by the National Institutes of Health

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The National Institutes of Health's National Institute of Allergy and Infectious Diseases has released what it describes as "2,000+ science and medical art visuals" into the public domain as a part of its "BioArt source" beta. These constitute vector images of everything from people to cell organelles, and (at least in my opinion) would be amazing in contribution to either digital or physical collage.