HDAC9 and rhabdoid tumor: Comparing protein expression in different SMARCB1 negative rhabdoid tumor cell lines (A204, G401, BT16, BT12) with ESCs (OG2; as a control with known highly expressed HDAC1 and HDAC2) demonstrate that group 1 HDAC levels are similarly expressed in rhabdoid tumors and ESC (Figure 1D).