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4. By Unknown Photographer - This image was released by the National Cancer Institute, an agency part of the National Institutes of Health, with the ID 2703 (image) (next)., Public Domain, Retrieved from https://commons.wikimedia.org/w/index.php?curid=24052431
5. By © NevitDilmen, CC BY-SA 3.0. Retrieved from https://commons.wikimedia.org/w/index.php?curid=18633668