STAG2 and Ewing sarcoma: We chose two cell lines, A673 and TC32, which we felt would be representative of our cell lines and had diversity amongst the other genes that may play a role in eventual subtyping of Ewing sarcoma, TP53 and STAG2. TC32 has a functional p53 gene while A673 has a frameshift mutation rendering p53 nonfunctional.