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What is the (approximate) number of serotonergic neurons in the dorsal raphe nucleus (DRN) of mice and rats?

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The mouse and rat dorsal raphe nuclei contain about 9000 and about 11.500 serotonergic neurons, respectively. It turns out the corresponding 1988 and 1982 references are widely cited - directly as well as indirectly. I could not find any newer data/evaluations.

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