1. Department of Biochemistry and Molecular Biology, University of Texas, MD Anderson Cancer Center; Houston TX USA
2. Laboratory for Embryonic Induction, RIKEN Center for Developmental Biology; Hyogo Japan
3. Electron Microscope Laboratory, RIKEN Center for Developmental Biology; Hyogo Japan
4. Program in Developmental Biology, Baylor College of Medicine; Houston TX USA
5. Program in Genes and Development, University of Texas, MD Anderson Cancer Center; Houston TX USA