MYCN and neuroblastoma: RNA-Seq expression levels (fragments per kilobase of exon per million fragments mapped (FPKM)) showed high levels of MYC in human Group 3 MB lines D283, sD425, and MB002 (Fig. 1a) and high levels of MYCN in GTML2 cells and in a human neuroblastoma cell line, Kelly, that was also included in the analysis.