I want to know the answer to the following question:
What would the loss of the SCN cells cause in the sleep-wake rhythm?
All the background I'm provided with is that "But the retina also contains specialized ganglion cells that are directly photosensitive, and project directly to the SCN, where they help in the entrainment (synchronization) of this master circadian clock.". Is that enough to answer the question?
Answer: no