ES cell line was grown on irradiated MEF feeders using standard culture conditions. Feeders were then depleted and ES cells plated on gelatin for ~2 days. RNA was isolated using Trizol/RNeasy, then hybridized to AffyMetrix mouse U74Av2 chip according to manufacturer's protocol. Data were normalized by AffyMetrix MAS5.0 using defaults. Keywords = embryonic stem cholesterol transport