Blastocyst Inner Cell Mass

**Definition:** The cluster of cells inside a blastocyst. These cells give rise to the embryonic disc and eventual embryo proper. They are pluripotent EMBRYONIC STEM CELLS capable of yielding many but not all cell types in a developing organism.

**Tree numbers:** - A16.254.500.533

**Synonyms:** - Inner Cell Mass of Blastocyst - Inner Cell Mass, Blastocyst