One Important Reason for Why Olfactory Ensheathing Glial Cells Have

One important reason for why olfactory ensheathing glial cells have been investigated as candidates for cell transplant experiments, such as in the spinal cord, is because these cells

A) are easily accessible by researchers.
B) are unique to the olfactory system, where the neurons are constantly replaced throughout life.
C) are easy to manipulate in culture.
D) express high concentrations of neurotrophic factors.
E) are capable of warding off gliosis in the event of injury.