1.   And in cases of infection, the blister may be a pustule, filled with pus, a cloudy liquid containing immune cells recruited to fight infective invaders.

2.   Bone marrow, for example, contains primitive cells that remain throughout life and that if stimulated, can produce new blood cells to repair damaged ones.

3.   A few of these are false negatives, containing cancerous cells the technologist missed.

4.   A biopsy proved one of them to contain malignant cells that had escaped the original breast tumor.

5.   But it also contains cells that have nothing to do with movement, and the doctors must distinguish among them all for the operation to work.

6.   But the date was delayed when the drug agency unexpectedly decided in April that it would begin regulating transplants that contained cells that had been processed outside the body.

7.   Earlier assays did contain animal cells, raising the possibility that a co-factor, possibly some cryptic genetic material or a virus, might cause the disease.

8.   From there they enter the primary auditory cortex, which contains cells that specialize in particular frequencies.

9.   It sees skin grafts as foreign because they contain cells displaying a non-self MHC.

10.   It contains special cells that gather light and enable vision.