The blastocyst has only three parts: the inner cell mass (A), the trophoblast cell layer (B), and the inner cell cavity (C). The inner cell mass is the part that in nature goes on to form the ...

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 ...

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.

The presence of two types of hair cells, the inner and outer hair cells, in the organ of Corti was appreciated nearly a 100 years ago but the function of the two has only become clear in the last 20 ...