Epithelium from proximal 1/3 of mouse intestine was isolated by incubation with 5mM EDTA in PBS for 45 minutes at 4°C. Cells were snap-frozen in liquid nitrogen and pooled for subsequent ChIP analysis. Whole cell lysates were sonicated, but not immunoprecipitated. The ChIPseq DNA Sample Prep Kit (Illumina) was used to prepare libraries, and 50 bp single-end reads were sequenced on an Illumina Hi-Seq 2000 instrument.