Although most cells in the human body contain the same genetic information, our body contains about 200 different cell types. How come? The answer lies in different subsets of genes being switched on in different cell types. Epigenetic marks often determine which subsets of genes are switched on. For an embryo to be able to develop into a baby with all different types of cells all previous parental epigenetic marks, such as chemical alterations of DNA and its associated proteins, must be reset. Azim studies how epigenetic marks are erased and reset in a process called epigenetic reprogramming.