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The writer is considering adding a sentence at this point of the essay.

Assuming all of the following are true, which one would create the most logical and appropriate addition at this point in the essay?


Adipocytes, also known as lipocytes or fat cells, are the cells that compose adipose tissue, and specialize in storing energy as fat


Alexander Seifalian has patented the polymer material he uses, as well as patents for blood vessels, tear ducts and windpipes using his techniques.


Stem cells are undifferentiated cells that are capable of becoming other kinds of cells, such as skin cells.


The process of seeding the stem cells on the polymer substrate is both costly and time-intensive at the present, but regulatory approval for the process might conclude by 2016.

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