For instance , grass pollen allergens cross-react with food allergy proteins in vegetables such as onion , lettuce , carrots , celery and corn .
Among seasonal allergies , there are some allergens that fuse together and produce a new type of allergy .
Grass pollen allergens cross-react with food allergy proteins in vegetables such as onion , lettuce , carrots , celery and corn .
Among seasonal allergies , there are some allergens that fuse together and produce a new type of allergy .