Which of the following is thought to be a major factor in the failure of damaged CNS neurons to regenerate their axons? a. There are no known adult neurons that can regenerate axons. b. Inhibitory factors prevent robust axonal regeneration in the CNS. c. Axons have no guidance regarding the direction in which they should regenerate. d. Damaged neural regions no longer express a neuroprotective caspase gene. e. Loss of glutamate from damaged regions results in too little glutamate to support synaptic signaling.

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