1.   Each individual cell grows as a vertical column by inserting new cell wall material uniformly along its length.

2.   Since the amount of nuclear material increases as cells grow and divide, new pyrimidines and purines had to come from somewhere.

3.   The researchers showed cancer develops when the function of oncogenes is disturbed and cells grow without control, the Karolinska Institute said.

4.   As new cells grow on the surface, the older cells get pushed farther back into the middle, which gradually becomes denser and stiffer.

5.   As the cells grow, the polymers dissolve.

6.   As the cells at Geron grow older, other, later-acting causes of senescence may appear.

7.   Auxins are present in greater concentrations on the darker side of the plant shaft, so those cells grow longer than the cells exposed to light.

8.   Because the cells grow and divide indefinitely in culture, very few blastocysts would be needed.

9.   But Geron has discovered an enzyme, known as human telomerase, that enables cells to grow and divide an unlimited number of times.

10.   But the identification makes sense, he said, because in the developing embryo the brain cells grow out from stem cells that line a hollow tube.