MYCN and neuroblastoma: Immunoblot analysis of monolayer cultures demonstrated also higher protein expression of CXCR4 in MNA (Kelly, SK-N-BE(2)) compared to MNN (SK-N-AS, SK-N-SH) cell lines, whereas the protein expression of BMI1 and NANOG did not correlate with the MycN status of the NB cell lines (Figure 7a).