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Do you know about EcstasyData.org?
It's a project of Erowid Center that does anonymous laboratory testing of
ecstasy/molly and other drugs, and publishes the results weekly. [Check Results]
The Lancet

1998

Positron emission tomographic evidence of toxic effect of MDMA ('Ecstasy') on brain serotonin neurons in human beings
by U. D. McCann; Z Szabo; U Scheffel; R.F. Dannals; G. A. Ricaurte
The Lancet Vol 352, Oct 31, 1998, 1437
(Online Copy)(Hardcopy)