[1] UNIV CINCINNATI, DEPT MOLEC & CELLULAR PHYSIOL, CINCINNATI, OH 45267 USA
[2] INDIANA STATE UNIV, DEPT LIFE SCI, TERRE HAUTE, IN 47809 USA
[3] FAC MED NECKER ENFANTS MALAD, INSERM U344, F-75730 PARIS, FRANCE
[4] PENN STATE UNIV, CTR GENE REGULAT, DEPT BIOCHEM & MOLEC BIOL, UNIVERSITY PK, PA 16802 USA