Immune system

"The immune system in our gut encounters a surge of foreign substances every day, whether it's the food we consume or the microbes that find their way in."https://medicine.yale.edu/news-article/researchers-uncover-a-backup-defense-system-in-the-gut/?utm_source=join1440&utm_medium=email&utm_placement=newsletter&user_id=66c4c92f5d78644b3ac5d5b4