GREB1 and neuroblastoma: Having said this, our RNA-seq performed on NB cells with or without GREB1 depletion (Fig. 2, A and B) revealed a newly identified 388 potential “GREB1-signature genes in MNA+ NB” (Fig. 2Civ), suggesting that MYO1B may be only one of a larger set of functional mediators of GREB1 in NB.