challenge: What is the role of Rab11FIP5 in the nervous system?
  
  A. Regulating the localization of the presynaptic GABA-type glutamate receptor
  B. Regulating the expression of neurotransmitters in the synaptic cleft
  C. Regulating the localization of the postsynaptic AMPA-type glutamate receptor
  D. Regulating the structure of the neuronal cytoskeleton
  Answer: 