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What insights into the phenomena of cell fate determination and cell migration has the study of the urodele neural crest provided?

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Figure

Fig. 1. Localizationof thegastrula.prospectiveneuralcrest(nc) in a urodele Using vita!dyes, the NC has been traced back to this stage
Fig. 5. Migratoryroutesof NC cells in the trunkof a urodeleembryo(premigratorycreststage;schematicrepresentationof a transversesection).The routes are directeddorsolarerally (betweensomltes.som.and epidermis.epi)
Fig. 16. The effectof differentpigmentECMson thefateof axolotlNC cells.PremigratoryNC cells from an axolotlembryo(stage 25; left) were seededon microcarrierspre incubatedin a dark embryo(stage 25) with dorsolateral(subepidermal)ECM (I-ECMJ or with ventromedialECM (betweenneuraltube and somites;m-ECM),On I-ECM.someNC cells differentiatedintocells (melanophores,filled circles;xanthophores.dottedcircles);on m-ECM.someNC ce/fs differentiatedinto neurons(cells with proc-esses).Undifferentiatedcells,opencircles.RedrawnafterPerriset al(1988)
Fig. 25. Transverse cryosectionneuronsor chromaffincells; arrows)

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