When SKN neuroblastoma cells, endogenously expressing ephrinBs, were cocultured with EphB2ΔC-GFP+ HeLa donor cells, reverse trogocytosis was observed (Fig. S1 E) and endogenous Gulp1 was coimmunoprecipitated with endogenous ephrinBs (Fig. S1 F). This evidence concerns the gene GULP1 and neuroblastoma.