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Not only did the Prozac-treated mice have more young neurons than untreated mice, but their neurons had more branchlike extensions, called dendrites, than did neurons from untreated mice.
The researchers located such RNAs within single brain cells and even within single dendrites, the branchlike extensions of nerve cells that enable them to communicate with each other.
Besides receiving incoming signals from other brain cells, a neuron's branchlike dendrites somehow participate in computations that the cell makes to decide whether it should fire or not.