Chromatin is DNA plus the proteins (and RNA) that package DNA within the cell nucleus. The primary functions of chromatin are: to package DNA into a smaller volume to fit in the cell, to strengthen the DNA to allow mitosis and meiosis and prevent DNA damage, and to control gene expression and DNA replication. In this book, the authors present topical research in the study of chromatin including the varied functions of aurora kinases A and B in mitosis and carcinogenesis; the chromatin state of pluripotent stem cells; MITF meets chromatin in melanoma; the state of chromatin as an integrative indicator of cell stress; analyzing DNA damage and its repair throughout entire genomes; the cloning process, structural characterization of Revolver transposon and its patented application for chromosome tags; DNA damage and Rad16; and glucocorticoid-induced chromatin remodeling.