A key advantage of the method using a weakened rabies virus relative to that of anterograde and retrograde labeling techniques is that __________.
A. the weakened rabies virus technique can be used in living brains
B. the weakened rabies virus can identify serial connections among two or more neurons
C. anterograde and retrograde labeling procedures take weeks as opposed to hours to trace connections
D. levels of the virus in an area are an indication of the relative activity of the area
Answer: B
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