它由星形细胞瘤，少突胶质细胞瘤，室管膜瘤发展而来，它们是由神经外胚层细胞诱导的。
It developed from astrocytoma, oligodendroglioma, ependymoma, which were induced by neural ectoblast.
结果提示：视网膜母细胞瘤来源于神经外胚层上皮，向神经元和光感受器方向分化。
The results suggested that retinoblastoma originated from the retinoblast with potential of differentiation into photoreceptors and neurons.
残留细胞注射部位形成畸胎瘤，瘤体组织中存在成熟的内胚层、中胚层和外胚层组织。
The residual cells were able to form teratoma at the injection site, and mature endoderm, mesoderm and ectoderm tissues could be found in teratoma tissues.
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