Epigenetic mechanisms diagram, National Institutes of Health

Wikimedia Commons file record for a National Institutes of Health diagram explaining epigenetic mechanisms, including DNA methylation, histone modification, aging, diet, and health endpoints. Commons metadata credits the original NIH Common Fund source as http://commonfund.nih.gov/epigenomics/figure.aspx; a 2026-07-08 direct fetch redirected to HTTPS and then a Cloudflare challenge, so the Commons record is retained as the machine-verifiable rights URL. The file page marks the work public domain as a United States government work. Used as a generic mechanism/surrogate artifact in the Blueprint case because Johnson's biological-age claims rely on DNA-methylation and other biomarker-clock outputs; the image does not depict Johnson, Blueprint data, or a Blueprint product.