We co-cultured NB cell lines stably expressing enhanced green fluorescent protein (EGFP) with MCF7 cells transfected with a control vector or NLRR1-HA (MCF7-ctrl and MCF7-NLRR1, respectively), because MCF7 cells had no detectable level of endogenous ALK. This evidence concerns the gene LRRN1 and neuroblastoma.