1.   A barrier layer cell has too slow a response time to be used in instruments that have a chopper.

2.   But the cell must already have an internal system which can respond to such signals and again the signal is being selective.

3.   Each cell has its own location and time of appearance in the roster of cell divisions.

4.   Every living cell has a nucleus.

5.   Luckily for Mr Holman, he received the transfusion before the parasitical cells had a chance to multiply.

6.   The cancerous cells had to be cut out.

7.   The prison cells have doors of heavy steel.

8.   The prison cells have no electricity and no floor coverings.

9.   Their cells have the most elaborate structure.