BDNF and neuroblastoma: Metabolomic profiles of several medicinal plants with known sedative effects, including Valeriana officinalis L., Melissa officinalis L., Hypericum perforatum L., and Passiflora incarnata L., were analyzed through GC/MS and LC–qTOF/MS and correlated with brain-derived neurotrophic factor (BDNF) expression in neuroblastoma cell line.