The EWSR1 gene provides instructions for making the EWS protein, whose function is not completely understood. The EWS protein has two regions that contribute to its function. One region, the transcriptional activation domain, allows the EWS protein to turn on (activate) the first step in the production of proteins from genes (transcription). The other region, the RNA-binding domain, allows the EWS protein to attach (bind) to the genetic blueprint for proteins called RNA. The EWS protein may be involved in piecing together this blueprint. Some studies suggest that the RNA-binding domain is able to block (inhibit) the activity of the transcriptional activation domain, and thus regulate the function of the EWS protein.