Posted by Flash (134.32.125.71) on November 06, 1999 at 11:49:48:
Check out this link:
http://155.198.232.23/mim/drugs/html/psilocybin_text.htm
Look how close the two substances are. Both contain an Indole Ring as does LSD. In fact I believe that Serotonin is the only substance containing an Indole Ring that is NOT hallucnigenic.