- So a stem cell is the very earliest, primitive cell type
that we have in the human body.
So when an egg meets a sperm and you have a zygote,
that forms very, very early, right?
The very first cell of your body.
The very first couple of cells that form off of that,
we call human embryonic stem cells.
And that's because they have the potential
to become any cell in the human body.
- So a stem cell is essentially
a cell that hasn't decided what function
it wants to perform within the body.
So they can become a brain cell, a heart cell, skin cell,
lung cell, any kind of cell.