gluten allergies
...that many of the specific allergens of wheat causing gluten allergies have not yet been characterized?
...that many of the specific <a href="./Allergen" id="mwCx4" rel="mw:WikiLink" title="Allergen">allergens</a> of <a href="./Wheat" id="mwCx8" rel="mw:WikiLink" title="Wheat">wheat</a> causing <b id="mwCyA"><a class="mw-redirect" href="./Gluten_allergies" id="mwCyE" rel="mw:WikiLink" title="Gluten allergies">gluten allergies</a></b> have not yet been characterized?