They discovered that animals living in the enriched environment had higher levels of a protein called brain-derived neurotrophic factor (BDNF).
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。
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The neurofilament protein immune-positive neurons and gray scale in ipsilateral oculomotor nucleus in all neurotrophic groups were significantly increased compared with normal saline group (P< 0.05).
To construct a recombinant plasmid containing protein transduction domain (PTD) and brain derived neurotrophic factor (BDNF) fusion gene and express in e.