Searching for naïve human pluripotent stem cells

Figure 1 First two cell segregations during preimplatation embryonic development. A: In blue, cells from the inner cell mass (ICM) in the early blastocyst, and white, cells from the trophectoderm; B: At the late blastocyst stage, cells from the ICM segregate into cells from the epiblast (green) and the primitive endoderm (orange).