PINE:

A． Which species, human or dog, has greater numbers of the neurotransmitters that have been hypothetically linked to narcolepsy
B． At what age do human beings first experience the degenerative effects of narcolepsy
C． What role do human leukocyte antigens perform for the human immune system
D． Why did Honda initially suspect that HLAs played a role in narcolepsy
E． Which of the researchers named in the passage isolated narcolepsy as a distinct syndrome

A． neural degeneration may occur too early for scientists to be able draw many useful conclusions about it
B． a loss of neurons would be undetectable unless the dead cells were concentrated in a particular area of the brain
C． pathologists not only were researching the wrong stage of the disease process, but ignoring its unique effects on different species
D． the brain tends through its natural processing to remove the effects of neural degeneration
E． the theories of Aldrich and Mignot were largely correct, at least as far as dogs are concerned