The blastocyst stage is characterized by the presence of a blastocyst cavity, outer cell mass and inner cell mass. Embryonic stem cells are derived from the inner cell mass of the blastocyst.

sometimes called "pluripotential stem cells" (PSCs), are found in the inner cell mass of the preimplantation embryo and in certain cell populations of the early fetus. Stem-cell research took a ...

What can we use iPS cells for? ES cells were originally derived from the inner cell mass (ICM) or epiblast of mouse embryos. These cells exhibit an almost unlimited proliferative capacity in ...