The action of psilocin can be compared with that of serotonin: 5-HT increased the phosphorylation state of phospholamban in the atrium of 5-HT4-TG and in isolated, perfused hearts of 5-HT4-TG, but not those of WT, and this led to arrhythmias [10]. This evidence concerns the gene PLN and cardiac arrhythmia.