The passage supplies information to answer which of the following questions? A. How old is the average unilateral megalencephaly patient? B. Can fetal brain cells be used to treat unilateral megalencephaly? C. Have scientists found a way to allow cells from victims of unilateral megalencephaly to exist outside of the body? D. How long can neurons culled from tumors be sustained outside the body? E. Will scientists find further experimental uses for neurons culled from unilateral megalencephaly victims?