Psychedelic drugs could have two distinct overlapping effects based on their affinity for two receptors involved in neuronal plasticity. Scientists at the University of Helsinki have observed that lysergic acid diethylamide (LSD) and psilocin (a drug isolated from the mushroom Psilocybe mexicana) have an antidepressant effect that is independent of their hallucinogenic outcome. These two different pathways are established through their binding to the tyrosine kinase receptor (TrkB), which has an antidepressant nature, or to the serotonin receptor, with a hallucinogenic activity.