Epigenetic Silencing of Nucleolar rRNA Genes in Alzheimer's Disease Pietrzak, Maciej ; Rempala, Grzegorz ; Nelson, Peter T. ; Zheng, Jing-Juan ; Hetman, Michal Abstract Publication: PLoS ONE Pub Date: July 2011 DOI: 10.1371/journal.pone.0022585 Bibcode: 2011PLoSO...622585P