#teratogen  any agent that interferes with normal embryonic development: alcohol or thalidomide or X-rays or rubella are examples
  supertype:  #agent  an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents"
  subtype:  #thalidomide  a sedative and hypnotic drug; withdrawn from sale after discovered to cause severe birth defects because it inhibits angiogenesis

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