Objective:To determine the role of vascular endothelial growth factor(VEGF)and pigment epithelium derived factor(PEDF)in vascularization of the developing retina.

目的：研究视网膜发育过程中血管内皮生长因子（VEGF）和色素上皮衍生因子（PEDF）所起的调节作用及其机制。

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Under the condition of decreased blood calcium, cartilage-derived factor (CDF) evidently inhibited cartilage GAG production.

在血钙降低的条件下，软骨衍生因子(CDF)对软骨糖胺多糖的合成代谢有明显的抑制作用。

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Pigment epithelium-derived factor (PEDF) is a multi potent neurotrophic factor with potent activity both in the central nervous system and in the retina.

色素上皮衍生因子(PEDF)是一种多能神经营养因子，在中枢神经系统和视网膜中均具有很强的活性。

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Instead, mix models only grossly estimate this value with an externally derived factor of 2X the immediate effect for the longer-term effect.

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In 2004 biotech firm Amgen began trials of a Parkinson's drug called glial cell line-derived neurotrophic factor, or GDNF.

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Research indicates that a diet high in added sugar reduces the production of a brain chemical known as brain-derived neurotrophic factor (BDNF).

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