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Reference.org
5-HTTLPR
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<p>5-HTTLPR (serotonin-transporter-linked promoter region) is a degenerate repeat (redundancy in the genetic code) <a href="/facts/Polymorphism_(biology)/lf32kgfV">polymorphic</a> region in <i><a href="/facts/SLC6A4/VPh5wtCy">SLC6A4</a></i>, the <a href="/facts/Gene/e1swwPY6">gene</a> that codes for the <a href="/facts/Serotonin_transporter/VPh5wtCy">serotonin transporter</a>. Since the polymorphism was identified in the middle of the 1990s, it has been extensively investigated, e.g., in connection with <a href="/facts/Neuropsychiatric_disorder/EPNjFtFf">neuropsychiatric disorders</a>. A 2006 scientific article stated that "over 300 behavioral, psychiatric, pharmacogenetic and other medical genetics papers" had analyzed the polymorphism. While often discussed as an example of <a href="/facts/Gene-environment_interaction/WCFHY5YW">gene-environment interaction</a>, this contention is contested. </p>