Low-density lipoproteins (LDL) — commonly known as bad cholesterol — have long been on scientists’ radar as a major contributor to heart disease. But these microscopic troublemakers have hidden their inner workings behind a maze of complexity. That is, until now. Researchers have now revealed the specific shape and structure of one of the body’s most important yet complicated proteins: ApoB100. Acting as a kind of molecular exoskeleton, this protein wraps around LDL particles, allowing them to travel through the bloodstream, researchers found.