Fig. 2
From: Generation of viable blastocysts from discarded human cleavage embryos
Micrograph showing the three different morphology grades (A, B, C) (Hardarson 2003) of blastocysts. Grade A, grade A blastocysts were expanded with a distinct inner cell mass (ICM) and many cells organized in the trophectoderm. Grade B, grade B blastocysts were either poorly expanded and/or with less defined ICM and trophectoderm cells but without signs of degenerative foci. Grade C, blastocysts exhibited poor morphology, characterized by a number of degenerative foci in the ICM and trophectoderm and a poorly developed blastocyst cavity