Selected HOMUR cells show resistance to UDCA-induced growth arrest. (A) HCT116, (B) HOMUR 7, (C) HOMUR 11, or (D) HOMUR 17 cells were plated into 35 mm plates and allowed to attach for 48 hours. Subsequently the plates were either left untreated (closed circles) or 500 micromolar UDCA was added to the media (open circles) and incubation continued. Sample plates were removed at the time intervals indicated and the number of cells counted. Experiments were performed in triplicate and the average values graphed. Error bars represent standard deviation.