Western blot analysis (Figure 1D, Supplementary Material: Figure S1) confirmed that among the six NB cell lines tested, CHP212, CHP134, BE2-M17, and IMR-32 exhibited strong expressions of both INSM1 and N-Myc, whereas SK-N-SH and SH-SY-5Y lacked detectable levels of these markers. Here, MYCN is linked to neuroblastoma.