High-Throughput Screening of Chromatin Immunoprecipitates Using CpG-Island Microarrays running title: ChIP-chip analysis of human promoter regions Matthew J. Oberley, Julissa Tsao 2 , Patrick Yau 2 , Peggy J. Farnham 1# 1 McArdle Laboratory for Cancer Research University of Wisconsin Medical School 1400 University Ave Madison, WI 53706 2 Microarray Centre University Health Network Toronto, ON M5G 2C4 # corresponding author: 608-262-2071 (tel); 608-262-2824 (fax); farnham@oncology.wisc.edu