1. Effect of oxygen concentration on human embryo development evaluated by time-lapse monitoring 
Kirstine Kirkegaard, M.D., Johnny Juhl Hindkjaer, M.Sc., Hans Jakob Ingerslev, D.M.Sc. 
Fertility and Sterility 
Volume 99, Issue 3, Pages e4 (March 2013)
DOI: /j.fertnstert
Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
The cumulative development of embryos progressing through (A) third cleavage cycle and (B) early blastocyst stage.
Fertility and Sterility  , e4DOI: ( /j.fertnstert )
Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions