Medical Genetics Chemical Agents Examples of substances that are mutagens are nitrous acid hydroxylamine, ethyl methanesulfonate, 5-bromouracil celery, benzo(a) pyrene acridine dyes, fungally contaminated peanuts or peanut butter, and many, many moreMedical Genetics Chemical Agents Examples of substances that are mutagens are nitrous acid, hydroxylamine, ethyl methanesulfonate, 5-bromouracil, celery, benzo (a) pyrene, acridine dyes, fungally contaminated peanuts or peanut butter, and many, many more