Hemophilia is a rare blood disorder, and people born with this condition have little or no clotting factor, a protein that controls bleeding.

血友病是一种罕见的血液疾病，遗传这种病的人极少或没有凝血因子，这些正是一种控制出血的蛋白质。

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This protein is called nerve growth factor (NGF).

这种蛋白质被称为神经生长因子（NGF.）

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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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She was widely recognized by other researchers for her work with a protein called transforming growth factor-beta.

VOA: special.2009.01.27

In order to attract the rabbit's own stem cells to re-grow the cartilage, channels in the scaffold were filled with a growth factor protein.

VOA: standard.2010.08.11

The antiviral gene comes from a rhesus macaque, and produces a protein called a restriction factor that can resist Aids-causing viruses affecting other animals.

BBC: Glowing cats shed light on Aids

Enbrel works by blocking a long-mysterious protein in the immune system known as tumor necrosis factor, or TNF.

FORBES: Chemical Chameleon

The public has mostly focused on Erbitux's ability to slow tumor growth by blocking epidermal growth factor receptor, a key growth-promoting protein that is overabundant in many cancer cells.

FORBES: Bristol, ImClone File On Erbitux