File:8 serotonin 2 knowing-neurons1.jpg
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![File:8 serotonin 2 knowing-neurons1.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/8_serotonin_2_knowing-neurons1.jpg/491px-8_serotonin_2_knowing-neurons1.jpg?20170112172426)
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