Dr. Dillinger investigates how gene activity is regulated within a cell, what signals switch genes "on" or "off," and in particular, what determines whether a given cell will become a skin cell, a nerve cell, or a heart muscle cell. His area of research is called epigenetics.

Question

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The passage states that Dr. Dillinger's area of research is epigenetics, which investigates how gene activity is regulated and what determines a cell's specialization. Therefore, statement A is true.

Dr Dillinger Investigates How Gene Activity Is Regulated Within a Cell