11.   The cells of viruses are so simple, they hardly qualify as cells at all.

12.   The human cancer cell could not be more different.

13.   Then the cells were exposed to cytomegalovirus, to which the muscle cells are particularly susceptible.

14.   When the horse is resting, this heat production is minimal because the muscle cells are fairly inactive.

15.   The brain cells are inactive during sleep.

16.   These immature T cells are very susceptible to apoptosis and are normally short-lived.

17.   It is here already for severe combined immunodeficiency, where the gene is cloned, the affected cell is easy to access, and the biochemistry is well understood.

18.   Acinar cells were typically pyramidal in shape with closely packed rough endoplasmic reticulum, numerous mitochondria and abundant apical zymogen granules.

19.   During development, intestinal endodermal cells are responsive to mesenchymal stimuli by cell to cell and cell to matrix interactions.

20.   Early endodermal cells are pluripotent, proliferate readily in culture, and in combination with mesenchyme, are capable of morphogenesis after transplantation.