Stem Cell Definition:
A cell that has not gone through differentiation

A stem cell is a cell that has not gone through the process of cell differentiation.  In other words, it is undifferentiated.

This makes stem cells very useful because they still have the option to become any type of specialized cells such as muscle cells, epithelial cells, nervous cells…etc.

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20170418 stem cell
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20170419 stem cell p2
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Knowing this about stem cells, it is not hard to understand why they are important in medical research.  For example, if a person has a damaged liver, we repair the damage by:

  1. Gathering and growing his stem cells.
  2. Differentiating these stem cells into liver cells
  3. Then, use these liver cells to replace the damaged parts of the liver.

Next Generation Science Standards:

MS-LS1-3 Use argument supported by evidence for how the body is a system of interacting subsystems composed of groups of cells.

HS-LS1-2 Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

What Science Does this Comic Teach?

Unit: Anatomy

⇒Chapter: Immunology

⇒Topic: Stem Cell

Additional Information


Or cell differentiation, this noun describes the process in which a cell selectively activates specific parts of its DNA in order to become a specialized cell with specific functions.
For more info, view this  comic:


This adjective is used to describe a cell that has not gone through the process of cell differentiation.


DNA is the genetic material that defines an organism’s traits and characteristics.

Muscle Cell

The cell that makes up your muscles.  A type of cell that is responsible for creating bodily movements.

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