A Molecular Model for the Interaction of Ethidium Bromide with Deoxyribonucleic Acid

Abstract
X‐ray diffraction and molecular model building studies have led to a model for the interaction between deoxyribonucleic acid (DNA) and ethidium bromide in which the planar ring system of the drug is intercalated between successive base‐pairs of the DNA. This model is compared with that proposed by Lerman for the DNA‐proflavine interaction.