1. Departments of Pediatrics (Q.L., K.G.H., F.S.F., S.H.H.), University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599
2. Cell and Developmental Biology (P.S., G.G., R.T.R., M.G.O., P.P.), University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599
3. State Key Laboratory of Molecular Biology (Q.L.,Y.-L.Z.), Institute of Biochemistry and Cell Biology, Shanghai Institute for Biological Science, Sinica Academia, Shanghai 200031, China
4. Laboratories for Reproductive Biology (Q.L., K.G.H., P.S., G.G., R.S., R.T.R., M.G.O., P.P., F.S.F., S.H.H.), University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599
5. Department of Biochemistry (A.J.R.), Indian Institute of Science, Bangalore, India 560012