During cellular differentiation and development the expression patterns of genes undergo significant changes. Many of these changes which are unique for a cell type are inherited in all proceeding generations of cells. The principle molecular mechanisms for maintaining these unique gene expression patterns during cellular differentiation are epigenetic modifications. Consequentially deciphering the changes in epigenetic modifications during development should improve our understanding of the mechanisms involved in the development of an organism, allowing us to develop better medicines to treat diseases. My research focuses on examining specific epigenetic marks in cell lines and tissues at different stages of development.