12.+Cell+Differentiation

__Cell Differentiation__
In multicellular organisms, similar cells become different as the organism grows and develops. In other words, the cells are no longer identical to the parent cell in structure or function. An example is when a cell becomes a red blood cell. Its shape becomes more concave, it loses its nucleus and a red pigment called haemoglobin develops inside the cell.

__Lack of Differentiation__
When a cell continues to divide without differentiating (changing) it results in the formation of a large mass of abnormal cells known as a tumour. If the abnormal cells stick to other cells and spread to other tissues it results in cancer.

2. Comment on the discussion for this page. Do you know anyone that had cancer?
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