The cells were still dividing, but it was only a matter of time.

Human cells grown in a test tube will usually divide about 50 times.

Normally, human cells divide only a certain number of times, about 50 to 100, before dying.

What I had found was something there that controlled the overall rate at which cells divided.

In the former, cells divide until they form new colonies, which are then released.

This band marks the position where the cell will eventually divide.

The cell can now divide to give two daughter cells.

When they are reduced to a certain point, the cell can no longer divide.

Most living species have at least one upper limit on the number of times cells can divide.

Specific growth rate constant is a way of measuring how fast the cells are dividing in a culture.