Pap's smear. Microscopic view of pap smear showing severe inflammatory smear with reactive cellular changes. NILM. cervical cancer diagnosis. 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 Papilloma Virus images and footage.

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