Aggrecan in: (A) Receptor over platelets, (B) A molecule present in osteoid tissue, (C) Granules in leukocytes, (D) Important component of cartilage
Answer is D. Aggrecan is the major proteoglycan component of cartilage. It is composed of several glycosaminoglycans (hyaluronic acid, chondroitin sulfate and keratin sulfate) and both link and core proteins.