Teratogen: any agent that disrupts a developing embryo such as the following:  Mutated Genes: interfere with developmental program 

• Physical Agents: X-Rays, Heat 
• Chemical Agents: Steroids, Alcohol, Drugs 
• Viruses: herpes, Rubella (German Measles) viruses 
• Other: lack of a specific, essential component can also lead to abnormal development (e.g., FA & Spina Bifida) 

This information was provided by Professor Danton H. O'Day - Univerisity of Toronto at Mississauga - Canada. Unless otherwise stated the information and graphics that are presented within this embryology section are the sole property of Danton H. O'Day, copyright 1998(c), 1999(c), 2000(c), 2001(c), 2002(c).

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