Weill Cornell Medicine Jul 18 2025 A protein called PAR1 helps lymphatic vessels structurally transform to boost fluid drainage and support healing when the lungs are injured according to researchers from Weill Cornell Medicine. Injury—whether by infection, toxins, or trauma—can cause fluid buildup in the lungs, making it hard to breathe. In response, the body's lymphatic system, a network of vessels, tissues and organs, ramps up to clear inflammation. Excess fluid called lymph is removed from