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。
Birch pollen, one of the most common causes of hay fever in Britain.
在英国，桦树花粉是花粉症的最常见诱因之一。
This is because the protein found in birch pollen to which people are allergic is very similar to proteins found in the flesh of apples.
这是因为在引起人们过敏的白桦树花粉中找到的蛋白质和在苹果果肉中发现的很类似。
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