NeuroblastomaGene AmplificationOncogene ProteinsGenes, mycNuclear ProteinsGanglioneuroblastomaProto-Oncogene Proteins c-mycGanglioneuromaHemizygoteGene Expression Regulation, NeoplasticE-Box ElementsCell Line, TumorChromosomes, Human, Pair 2Gene DosageIn Situ Hybridization, FluorescenceNeuroectodermal Tumors