While EWSR1 translocates with ETS family proteins in Ewing’s sarcoma, it potentially encodes two fusion proteins EWSR1-PATZ1 and PATZ1-EWSR1, the latter of which will contain the BTB domain (Siegfried et al., 2019 ▸; Bridge et al., 2019 ▸; Chougule et al., 2019 ▸; Sankar & Lessnick, 2011 ▸; Mastrangelo et al., 2000 ▸; Im et al., 2000 ▸). Here, PATZ1 is linked to Ewing sarcoma.