Cancer and Cancer Cells:
Causes of Cancer and Contributers to:
By Unknown Illustrator - This image was released by the National Cancer Institute, an agency part of the National Institutes of Health, with the ID 2351 (image) (next).This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information.English | Français | +/−, Public Domain, https://commons.wikimedia.org/w/index.php?curid=24060608
The Spread of Cancer:
By Mikael Häggström.When using this image in external works, it may be cited as:Häggström, Mikael (2014). "Medical gallery of Mikael Häggström 2014". WikiJournal of Medicine 1 (2). DOI:10.15347/wjm/2014.008. ISSN 2002-4436. Public Domain.orBy Mikael Häggström, used with permission. - All used images are in public domain., Public Domain, https://commons.wikimedia.org/w/index.php?curid=6846551