[1] UNIV N CAROLINA, REPROD BIOL LABS, CB 7500 MACNIDER BLDG 202H, CHAPEL HILL, NC 27599 USA
[2] UNIV N CAROLINA, DEPT PEDIAT, CHAPEL HILL, NC 27599 USA
[3] UNIV N CAROLINA, DEPT BIOL, CHAPEL HILL, NC 27599 USA
[4] UNIV N CAROLINA, DEPT PHYSIOL, CHAPEL HILL, NC 27599 USA
[5] UNIV N CAROLINA, DEPT CELL BIOL & ANAT, CHAPEL HILL, NC 27599 USA
[6] UNIV N CAROLINA, DEPT BIOCHEM, CHAPEL HILL, NC 27599 USA