The cells were growing, but he did not believe the experiment was going right.

Cancer occurs when cells change and grow out of control.

He could feel them in every cell, growing stronger and more confident.

These procedures allow normal cells to grow back in their place.

That is because the cells are growing equally on all sides of the plant.

Cancer genes were supposed to make cells grow out of control, not stop.

I'm thinking about the way that crystals or cells grow.

But how can cells grow and develop to form such complex creatures?

When the cells began to clump together and grow dark.

In some patients, the fetal cells apparently grew too well.