Some Comments on Cluster of Differentiation/Designation(CD)Antigens _What are they? Differentiation antigens Expressed by cells at distinct stages of differentiation Expressed by cells having different functions How are they detected? Some Comments on Cluster of Differentiation/Designation (CD) Antigens ◼ What are they? ◼ Differentiation antigens ◼ Expressed by cells at distinct stages of differentiation ◼ Expressed by cells having different functions ◼ How are they detected?