The monoamine neurotransmitter, serotonin, also referred to by its chemical name 5-hydroxytryptamine (5-HT). It binds to and activates the 5-HT family of receptors.

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Epigenetics and serotonin?

In this article http://www.nature.com/neuro/journal/v17/n9/full/nn.3778.html it states that Increased promoter methylation of the serotonin transporter gene predicted increased threat related ...
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Serotonin activity with short 5-HTT promotor region and depression

So after reading a few studies (1,2) it seems that a shorter promotor region for the serotonin transport protein may be associated with increased likelihood of developing depression after stressful ...