http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=5202

Chemistry and pharmacology of serotonin.

http://nba.uth.tmc.edu/neuroscience/s1/chapter12.html

Monoamine Neurotransmitters: open-access ebook chapter with animations and self-quiz.

http://www.news-medical.net/health/What-is-Serotonin.aspx

Recent news on serotonin.

https://www.mayoclinic.org/diseases-conditions/serotonin-syndrome/symptoms-causes/syc-20354758

Detailed information on serotonin syndrome.

http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=1615

Chemistry and pharmacology of MDMA.

http://www.drugabuse.gov/drugs-abuse/mdma-ecstasymolly

National Institute on Drug Abuse site for MDMA (Ecstasy/Molly).

http://www.dnalc.org/view/1402-Serotonin-Receptors-and-SSRIs.html

Video describing selective serotonin reuptake inhibitors and receptors.

http://www.dnalc.org/view/918-5-HTT-Gene.html

Map of the genetics of the serotonin transporter.