1.   Although oligodendrocytes themselves normally do not divide, the precursor cells that give rise to them do.

2.   How do electrically active axons signal oligodendrocyte precursor cells to divide?

3.   But the researchers still need to map the entire human brain to determine the precise location of the precursor cells.

4.   By understanding the biological differences among precursor cells, White said, it should be possible to remove only those polyps that pose a danger to the patient.

5.   Precursor cells are likely to be found in cancers of the breast, brain, prostate, bladder, lung and pancreas, he said.

6.   Studies to date show that the precursor cells are not found in the human cortex.

7.   The findings also raised the possibility that groups of precursor cells are present in the brain from birth but remain inactive in adult animals.

8.   The finding suggested that precursor cells might survive into adulthood in most areas of the living bird brain and that they were somehow generally inhibited from producing new neurons.

9.   The researchers devised a novel procedure for driving mouse embryonic stem cells down the particular line of development that leads to a pancreatic precursor cell.

10.   These precursor cells formed at least four types of pancreatic cells, including those that secrete insulin and two other hormones known as glucagon and somatostatin.