However,  a priori  is sometimes used to modify other nouns, such as truth. Philosophers also may use apriority and aprioricity as nouns to refer (approximately) to the quality of being  a priori .
Lectins are drawn right to that lining, and your immune system retaliates. Lectins are found in all foods, but in some more than others. All seeds of the grass family - wheat, rye, rice, spelt, etc. - are high in lectins. You also find lectins in beans, dairy and in the nightshades (tomatoes, potatoes, eggplant). According to a 1991 study, dairy may be potentially more harmful in pasteurized, processed milk because of the reduction of SIgA, an immunoglobulin that binds dangerous lectins.
Lectins are carbohydrate-binding proteins, macromolecules that are highly specific for sugar moieties. Lectins perform recognition on the cellular and molecular level and play numerous roles in biological recognition phenomena involving cells, carbohydrates, and proteins. Lectins also mediate attachment and binding of bacteria and viruses to their intended targets. Lectins are ubiquitous in nature and are found in many foods. Some foods such as beans and grains need to be cooked or fermented to reduce lectin content, but the lectins consumed in a typical balanced diet are not harmful. Some lectins are beneficial, such as CLEC11A which promotes bone growth, while others may be powerful toxins such as ricin.