It's an allergic reaction to tropomyosin, which is found in shellfish and cockroaches. I recall an anecdote of an entomologist who studied cockroaches in parti

It's an allergic reaction to tropomyosin, which is found in shellfish and cockroaches. I recall an anecdote of an entomologist who studied cockroaches in particular claiming to have developed a shellfish allergy from her work. https://en.wikipedia.org/wiki/Tropomyosin https://en.wikipedia.org/wiki/Tropomyosin