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I asked G3 (= the Genial Geneticists Grapevine) if a genetic cause for peanut allergies had been discovered. A Slovak-Hungarian geneticist working in Prague mentioned that in central and eastern Europe (and, to a lesser extent, in western Europe) peanut consumption was not very common, but that there was a comparable incidence of celery allergies. Complicated creatures that we are, there are various sub-types involving allergic reactions to leaves, stalks, oil, seeds and roots as well as whether the celery was cooked or not. Apparently, work is underway to look for genes. There are cross-allergies involving various members of the Apiaceae family (more than 3700 species and more than 400 genera) which includes celery, carrots, parsley and parsnips as well as ajwain, angelica, anise, asafoetida, caraway,  chervil, coriander, cumin, dill, fennel, hemlock, lovage, cow parsley and sea holly. There are also cross-allergies reported with birch, wormwood, mugwort, ragweed and latex.

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