Fourteen strains of hallucinogenic mushrooms of the species Psilocybe cubensis were grown under identical laboratory conditions at the Shamir Research Institute, operating under the auspices of the University of Haifa. Tests of individual mushrooms showed that the concentration of psilocybin, the main psychoactive compound in mushrooms, varies even within the same strain, and therefore the weight of a mushroom alone does not indicate the amount of active substance it contains.
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