We found enriched H3K27me3 signals in the entire CXCL9, CXCL10 and CXCL11 genomic region in five out of six MYCN-amplified NB cell lines (SK-N-BE, NB1643, COG-N415, NGP, Kelly and LAN-5) (figure 5A, B and online supplemental figure 3A–D), but only in one out of four MYCN-non-amplified NB cell lines (NB-69, NBLS, SK-FI, SK-N-AS) (online supplemental figure 3E-H). The gene discussed is CXCL9; the disease is neuroblastoma.