1 MODIFICATION OF HISTONES BY THE SUGAR β-N-ACETYLGLUCOSAMINE (GlcNAc) OCCURS ON MULTIPLE RESIDUES, INCLUDING H3 SERINE 10, AND IS CELL CYCLE REGULATED Suisheng Zhang, Kevin Roche, Heinz-Peter Nasheuer, and Noel Francis Lowndes* Genome Stability Laboratory & Cell Cycle Control Laboratory, Center for Chromosome Biology, National University of Ireland Galway, University Road, Galway, Ireland Runn...