Why Efforts to Expand the Meaning of "Teratogen" Are Unacceptable Disagreement about nomenclature in teratology is not new. Dissent even about the very fabric of the discipline-what congenital malformations consist of-has often been voiced. Time, instead of resolving such diffi- culties, has sometimes worsened them. For example, in the past it was agreed that congenital malforma- tions are abnormalities of structure present at birth, but differences...
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