AIM: To establish a stable and reliable method for fast cloning homologous genes of pollen allergens in allergen-containing plants.

目的：建立一套稳定可靠的方法，对过敏原性物种中的过敏原同源基因进行快速克隆。

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The allergen in jackfruit does not sensitize the immune system, but once birch pollen has done so, the immune system may react to jackfruit too.

菠萝蜜中的过敏原不会使免疫系统敏感，但是一旦桦树花粉刺激了免疫系统，免疫系统也会对菠萝蜜有反应。

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The explosive reactions are activated when an allergen (such as pollen particles) binds to receptors on the surface of the mast cell, which then opens and secretes part of its contents.

当变应原(例如花粉微粒)粘附到肥大细胞表面受体后，将引发爆炸反应，肥大细胞裂开并且分泌出部分内含物。

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"People who are diagnosed with asthma that is made worse by pollen and people who have been diagnosed with seasonal allergic rhinitis need to keep track of pollen and other outdoor allergen levels, " says Dr. William Lunn, the director of the interventional pulmonary service at Baylor College of Medicine, in Houston.

CNN: 5 Web weapons in your war on allergies

And pollen isn't the only allergen on the rise.

CNN: Why your allergies are bugging you

What constitutes a high pollen count also depends on what type of allergen is being tracked, according to AAAI.org.

CNN: What's in a pollen count, anyway?