1. The efficacy of the transfer of twice frozen-thawed embryos with the vitrification method 
Yoko Kumasako, B.E., Eiko Otsu, M.En., Takafumi Utsunomiya, M.D., Yasuhisa Araki, Ph.D. 
Fertility and Sterility 
Volume 91, Issue 2, Pages (February 2009)
DOI: /j.fertnstert
Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1 Vitrification of 2PN stage embryos using a 0.25-mL straw.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions

3. Figure 2
Vitrification of morula and blastocyst stage embryos using a 0.25-mL straw.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions