Figure 4: ES cells contribute to the epiblast of chimeric embryos cultured in vitro beyond the blastocyst stage.
From: Dynamics of anterior–posterior axis formation in the developing mouse embryo

dsRed expression marks the ES cell line introduced into the chimera and GFP marks the host embryo. The figure displays selected frames from a time-lapse movie (Supplementary Movie 4) of a single chimera from the implanting blastocyst to the egg cylinder stage. ivc, in vitro culture. Scale bars represent 100 μm.