在过去的40年里，科学家已明确指出，有超过一半以上的蛋白质作为生长因子，出现于血管再生活动中。

In the past 40 years, scientists have pinpointed more than a dozen proteins, known as growth factors, that appear to be involved in angiogenesis.

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他们发现生活在复杂环境下的小白鼠有一种名叫脑源性神经营养因子（BDNF）的蛋白质水平较高。

They discovered that animals living in the enriched environment had higher levels of a protein called brain-derived neurotrophic factor (BDNF).

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这种蛋白质被称为神经生长因子（NGF.）

This protein is called nerve growth factor (NGF).

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