Effects of psilocybin, psychedelic mushroom extract and 5-hydroxytryptophan on brain immediate early gene expression: Interaction with serotonergic receptor modulators oleh Elad Lerer, Elad Lerer, Alexander Botvinnik, Orr Shahar, Meitar Grad, Meitar Grad, Karin Blakolmer, Noam Shomron, Noam Shomron, Amit Lotan, Bernard Lerer, Tzuri Lifschytz