What is epigenome? How epigenome is different from genome? How do the epigenetic studies benefit us? How does epigenetic therapy work? This video provides short answers to those questions, and also shows some biotechniques such as DNA purification and cutting DNA out from a piece of gel. In the same webpage, "A Tale of Two Mice" gives a more in-depth explanation of how epigenetic differences result in different phenotypes and how environmental factors such as diets may alter epigenetic diseases.