Dear Annabelle,

I love a peanut butter and tuna sandwich. But when I was a kitten, my school outlawed peanuts. My classmate was super allergic to them. So, we had a rule to keep our friend safe. I packed plain tuna fish instead.

I talked about that with my friend Travis T. Denton. He studies medicinal chemistry and neuroscience at Washington State University.

He told me that epinephrine is the medicine people use for a serious allergic reaction called anaphylaxis. It comes in an auto-injector, or EpiPen.

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