MYCN and neuroblastoma: To further clarify the effect of CCNB1IP1 on cell proliferation, an EdU assay was also performed, and as shown in Figure 4C and Figure S4C, a significant reduction in the ratio of EdU‐labeled NB cells was observed in CCNB1IP1‐ablated MYCN‐AM NB cells versus controls, but not in MYCN‐NA NB cells.