Immunologists have demonstrated that insulin is expressed in the thymus? Not just in the pancreas.

免疫学家已经显示出胰岛素是在胸腺，而不是在胰腺表达。

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But most immunologists say that those in food products have not been sufficiently studied or standardized to draw scientific conclusions about what health benefits they provide.

但是大多数免疫学家说这些食品种的细菌还没有被充分研究，或者有科学结论表明他们对健康究竟有什么好处。

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Viruses have always attracted the interest of immunologists as possible triggers of autoimmune diseases due to their ability to interfere with the host's immune system.

拥有扰乱人体免疫系统的能力—病毒作为可能的自身免疫疾病始动因子通常是免疫学家们感兴趣的研究对象。

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Dr. Jennifer Holter, who has been treating Billy at Oklahoma University Medical Center since the fall of 2008, says several immunologists have reviewed his case but the underlying reason for his immunodeficiency is still unclear.

CNN: iReport: 'Billy's Disease' baffles doctors

"I think when you have close to 25 immunologists look at you and they can't figure out what's causing the problem, you can call that pretty rare, " she says.

CNN: iReport: 'Billy's Disease' baffles doctors