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Mar2-05, 01:55 PM
Sci Advisor
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I am curious to know how cells in developing organisms can know which direction to grow in, how much tissue is required and in what proportion, and how to differentiate to the right cells.
The answer is morphogen gradients. A cell expresses protein, the farther away another cell is, the less signal it will get.

Also, how do cells interpret genetic data?
Genetic data is expressed in proteins that do the function. There are feedback loops that tell the gene to either start expressing more of its protein, or less of its protein.