因为它具有干细胞特性，但是是恶性，而且耐化疗。
It has stem cell properties and is malignant, resistant to chemotherapy.
提示人胎儿下颌下腺中能分离出具有组织干细胞特性的细胞。
These indicate that these cells from fetus submandibular glands have the characteristics of tissue stem cells.
目的：研究视网膜祖细胞的干细胞特性及移植入视网膜后的存活和迁移。
Objective: to investigate stem cell characteristics of retinal progenitors and to observe their survival and migration after transplanted into vitreous cavity.
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