BDNF and neuroblastoma: After revalidating the differentiation of SH-SY5Y-A cells induced by sequential treatment of all-trans retinoic acid (ATRA) and brain-derived neurotrophic factor (BDNF), we reanalysed the public microarray data from three neuroblastoma cell lines (SK-N-SH, SH-SY5Y-A, and SH-SY5Y-E) at their undifferentiated and differentiated stages to get the signature genes of neuroblastoma differentiation.