Ultrafast X-rays reveal physical principles behind lipoprotein motion within egg yolk plasma

Egg yolk may appear runny and uniform, but on the nanoscale, it is one of the most crowded biological fluids in nature. Packed with proteins and fats, it serves as a dense storage reservoir for a developing embryo. Yet the tiny particles responsible for transporting these nutrients—low-density lipoproteins (LDLs)—must remain mobile enough to reach their destinations. How they navigate this complex "nanoscale traffic jam" has long puzzled scientists.