medium · LSAT Reading Comprehension
A new neuron does not contribute to brain function the moment it appears. The author explains that any therapy aiming to harness neurogenesis would have to support a complex chain of events: the cell must survive, then migrate to its proper location, then differentiate into the right type of neuron, and finally integrate by forming connections with existing circuits. A failure at any of these stages leaves the new cell useless.
According to the passage, the complex sequence of events a new neuron must complete in order to survive and function consists of
- staying alive, moving to its location, becoming the proper neuron type, and joining existing circuits
- replicating, evolving, and ultimately replacing the entire hippocampus
- absorbing nutrients, dividing rapidly, and stimulating the cells around it
- passing through animal-model testing, clinical trials, and final regulatory approval
- surviving, migrating, and differentiating, after which integration occurs automatically
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