6Wilson, M. R. & Bertenthal, M. L. Systems for state science assessment [M]. Washington, D. C. : The National Academies Press, 2005: 40.
7Weiss, I. R. & Pasley, J. D. What is high-quality instruction [J]. Educational Leadership, 2004: 61.
8Russell, J. Effects of lecture information density on medical student achievement [J]. Journal of Medical Education, 1984, 59: 881-889.
9Shaffer, D. W. & Resnick, M.‘Thick' authenticity: New media and authentic learning [J]. Journal of Interactive Learning Research, 1999, 10(2): 195-215.
1WH Johnson,NM Loskutoff,Y Plante,KJ Betterid.Production of four identical calves by the separation of blastomeres from an in vitro derived four-cell embryo. Veterinary Record . 1995
2A Nagy,J Rossant,R Nagy,W Abramow-Newerly,J C Roder.Derivation of completely cell culture-derived mice from early-passage embryonic stem cells. Proceedings of the National Academy of Sciences of the United States of America . 1993
3Condic ML.Totipotency;what it is and what it is not. Stem Cells and Development . 2014
4Blastomeres of the mouse embryo lose totipotency after the fifth cleavage division: Expression of Cdx2 and Oct4 and developmental potential of inner and outer blastomeres of 16- and 32-cell embryos(J)Developmental Biology . 2008 (1)
5Norie Arima,Yoshimi Uchida,Ruoxing Yu,Koh Nakayama,Hiroshi Nishina.??Acetylcholine receptors regulate gene expression that is essential for primitive streak formation in murine embryoid bodies(J)Biochemical and Biophysical Research Communications . 2013 (3)
6Todd S. Macfarlan,Wesley D. Gifford,Shawn Driscoll.Embryonic stem cell potency fluctuates with endogenous retrovirus activity. Nature . 2012