To study the consequences of allelic PHOX2B deletion in patients with neuroblastoma [35], we performed morpholino (MO) knockdown of zebrafish phox2b, using two non-overlapping antisense oligonucleotide sequences targeted to the phox2b gene: a translation-blocking MO (MOATG) and a splice-blocking MO (MOsplice) directed to the second exon/intron splice junction (Figure S2A). The gene discussed is PHOX2B; the disease is neuroblastoma.