Why is it important for the body to recognize its own cells ?

It's important your body to recognize it's own cells.

Explanation: The Immune system is a great defense mechanism which it protects your body from bacteria and foreign invaders.  The immune system can make this distinction because all cells have identification molecules on their surface.

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small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.