Gut bacteria , gut flora, microbiome. Bacteria inside the small intestine, concept, representation. 3D illustration. stock photo...

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Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that content. It's a win-win, and it's why everything on iStock is only available royalty-free — including all Human Gastrointestinal Microbiota images and footage.

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