Assertion: serotonin's action | /r/HasProperty | correlated to involved location
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text: Serotonin is involved in natural reward-related physiology and behaviour, from feeding to sexual activity  with many actions correlated to the involved location (cellular-tissue-organ concentration) and the different signaling can also be associated with its more than fourteen receptor subtypes, regulating physiological processes through different, even opposing mechanisms; these indoleamine effects include also serotonylation and interaction with GTPases .