What are the four types of stem cell? and give an example of each type, and explain how much each type can differentiate.

Embryonic stem cells
Tissue-specific stem cells
Mesenchymal stem cells
Induced pluripotent stem cells

Totipotent Stem Cells - They can differentiate into any type of cell of the human body or the placenta.
Example: Fertilized egg cells.
Pluripotent Stem Cells - They are from totipotent cells, and are able to differentiate into any type of cell in the human body. However, not any in hte placenta.
Example: Blastocyst cells.
Multipotent Stem Cells - They can only differentiate into a closely related cell.
Example: Blood stem cell
Unipotent Stem Cells - They can only produce its own type of cell.
Example: Skin stem cells (which can only become a new skin stem cell).

Hope this helps!!