11.   Researchers have looked at sleep deprivation in animals to determine, on the cellular level, what happens without sleep.

12.   Scientists in Israel call the process memory extinction, and they say it occurs on a cellular level within the brain.

13.   Something is wrong at the cellular level and the cells spread rapidly throughout the body.

14.   The body needs water at the cellular level for a host of metabolic processes, including kidney, gastrointestinal and brain functions, Pacheco said.

15.   The latest study focuses on a substance called anandamide that is produced by the body and which acts very much like THC on a cellular level.

16.   Thermal images peer down into the cellular level.

17.   They used a new biological tool called an Affymetrix chip to measure aging at the cellular level.

18.   This clustering seals tears at a cellular level and fuses damaged cells together.

19.   Dr. Ray Greek, spokesman for the Physicians Committee for Responsible Medicine, said the disease research can be already done at the cellular level.

20.   In his researches, Dr. Birkmayer found that a coenzyme occurring in all living cells plays a key role in energy production on the cellular level.