PRRX1 and sarcoma: These included tripartite motif protein 28 (TIF1β), a known transcriptional coactivator of nuclear receptors; heat shock cognate 71-kD protein, a chaperone previously identified in an array of TNF-induced proteins; radixin (ESP-10), another component of the “merlin” complex of ezrin-moesin-radixin described to block NF-κB-induced transcription; Ewing sarcoma homologue; and paired mesoderm homeobox protein 1 (Prx1, Prrx-1, MHox).