1. The Laboratory of Signaling and Gene Expression, Cecil H. and Ida Green Center for Reproductive Biology Sciences and The Division of Basic Research, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
2. Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
3. Howard Hughes Medical Institute and Department of Chemistry, Cornell University, Ithaca, NY 14850, USA.
4. Sarepta Therapeutics, Cambridge, MA 02142, USA.
5. Biolog Life Science Institute, D-28199 Bremen, Germany.