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Molecular biology is the study of biological molecules and their interactions, including DNA, RNA, proteins, lipids, and carbohydrates. In the context of epigenetics, molecular biology focuses on how these molecules contribute to gene expression and regulation. By understanding the molecular mechanisms underlying epigenetic changes, scientists can uncover new insights into development, aging, and disease. This field is closely related to genetics as it deals with the structure and function of genes at a molecular level, but it goes beyond genetics by considering how environmental factors and cellular processes influence gene expression. As such, molecular biology serves as a critical bridge between genetics and epigenetics, providing a framework for understanding how genetic information is translated into phenotypic traits.