ZEB1 and breast cancer: For example, in FOS MCF7 vs. IMR90 comparison, TFscope found that the binding sites of co-factor ZEB1 are more often present in peaks that are specific to MCF7 (a breast cancer cell line) rather than peaks that are higher in MCF7 but also present in IMR90 (a lung fibroblast cell line), highlighting the recently identified cooperation between ZEB1 and FOS in breast cancer [19].