Which of the Following Accurately Describes Some of the Inherent

Multiple Choice

Which of the following accurately describes some of the inherent difficulties in developing treatments for Parkinson's disease?

A) drugs that are given to patients must be able to cross the blood-brain-barrier
B) some transplanted dopaminergic neurons seem to develop pathology
C) re-growth of cellular processes after neuronal transplantation may not be as robust as in mice because of the longer distances involved
D) all of the above are accurate statements