1. Fertility and Sterility
Differences in the implantation rates of rat embryos developed in vivo and in vitro: possible role for plasminogen activators 
Eliahu D Aflalo, Ph.D., Uriel A Sod-Moriah, Ph.D., Gad Potashnik, M.D., Iris Har-Vardi, Ph.D. 
Fertility and Sterility 
Volume 81, Pages (March 2004)
DOI: /j.fertnstert

2. FIGURE 1
Percentage of implanted embryos in contralateral uterine horn of 17 pseudopregnant rats into which five in vivo- or in vitro-developed blastocysts were transferred (mean ± SEM). Numbers in parentheses are numbers of implanted embryos per transferred blastocysts. P<.01, paired t-test.
Aflalo. PA activity in rat embryo implantation.Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )

3. FIGURE 2
Endometrial uPA and tPA activity on days 1–5 of pregnancy. Different letters represent significant differences (analysis of variance followed by least significant difference test, P<.01).
Aflalo. PA activity in rat embryo implantation.Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )

4. FIGURE 3
Activity of tPA in preimplantation embryos developed in vivo and in vitro (means ± SEM). Different letters represent significant differences (analysis of variance followed by least significant difference test, P<.01).
Aflalo. PA activity in rat embryo implantation.Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )

5. FIGURE 4
Activity of uPA in preimplantation embryos developed in vivo and in vitro (means ± SEM). Different letters represent significant differences (analysis of variance followed by least significant difference test, P<.01).
Aflalo. PA activity in rat embryo implantation.Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )