DepartmentsofPharmacologyandBiologicalSciences&Biotechnology;
SchoolsofSciencesandMedicine;
TsinghuaUniversity;
Beijing100084;
China;
CenterforAnimalTransgenesisandGermCellResearch;
SchoolofVeterinaryMedicine;
DepartmentofAnimalBiology;
UniversityofPennsylvania;
NewBoltonCenter;
382WestStreetRoad;
KennettSquare;
PA19348;
USA;
DepartmentofPharmacology;
UniversityofMinnesota;
Minneapolis;
MN55455;
USA;