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Ogunbodede O, McCombs D, Trout K, Daley P, Terry M. 
“New mescaline concentrations from 14 taxa/cultivars of Echinopsis spp(Cactaceae) ('San Pedro') and their relevance to shamanic practice”. 
J Ethnopharmacol. 2010 Sep 06;131(2):356-62.
Abstract
The aim of the present study is to determine in a procedurally uniform manner the mescaline concentrations in stem tissue of 14 taxa/cultivars of the subgenus Trichocereus of the genus Echinopsis (Cactaceae) and to evaluate the relationship (if any) between mescaline concentration and actual shamanic use of these plants.
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