NeuroblastomaGliomaHybrid CellsEnkephalin, Leucine-2-AlanineEnkephalin, LeucineEtorphineReceptors, OpioidAlprostadilDiprenorphineReceptors, Opioid, deltaAdenylate Cyclase ToxinEnkephalin, MethionineTumor Cells, CulturedVirulence Factors, BordetellaGuanylyl ImidodiphosphateGTP-Binding ProteinsPertussis ToxinIloprostEnkephalin, D-Penicillamine (2,5)-Adenylate CyclaseBradykininBucladesineNaloxoneAdenosine Diphosphate RiboseCell LineKineticsCyclic AMPBrain NeoplasmsCalciumCell MembraneCell Line, TumorReceptors, MuscarinicGanglioneuromaNeuronsGlioblastomaTransfectionAstrocytomaOncogene ProteinsMembrane PotentialsOptic Nerve GliomaPotassium3-IodobenzylguanidineGenes, mycGene Expression Regulation, NeoplasticApoptosisNervous System NeoplasmsGanglioneuroblastomaGene AmplificationVanilmandelic AcidEsthesioneuroblastoma, OlfactoryMice, NudeBrain Stem NeoplasmsAbdominal Neoplasms