The Hidden Architecture of Immunity: How Cells Find Their Way in a Bird’s Body

Deep inside the body of a developing bird lies a small, often overlooked organ that quietly orchestrates one of the most essential processes of life: the making of immune cells. This organ, known as the bursa of Fabricius, is not widely known outside scientific circles, yet it plays a central role in shaping how birds defend themselves against disease. Within its folds, an intricate story unfolds, one that blends biology, chemistry, and the remarkable choreography of migrating cells.