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2013-Frecska E-Possibly sig-1R mediated role of DMT X.pdf
See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/236339046. A possibly sigma-1 receptor mediated role of dimethyltryptamine in tissue protection, regeneration, and immunity Article in Journal of Neural Transmission · April 2013 Impact ...

Have only just skimmed so far but looks like the hyptothesis is that with physical signals of agony, the lungs can synthesize large amounts of DMT.