Teratogens are environmental agents that can cause birth defects, or affect development of an embryo or fetus directly through exposure of the mother during pregnancy. The action does not occur by altering the genetic makeup of the embryo, although some agents, such as X-ray, can act as both a teratogenic agent and a mutagen (changing a gene by altering the DNA code).
KeywordsMercury Lithium Estrogenic Aspirin Cocaine
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