Peripheral blood refers to the blood that circulates throughout the body in the arteries and veins, carrying oxygen, nutrients, and waste products to and from the organs and tissues. Research involving peripheral blood typically focuses on analyzing the various components of blood, such as red blood cells, white blood cells, platelets, and plasma, to study different aspects of health and diseases. This research may involve studying markers in the blood to diagnose diseases, monitor treatment response, or understand the underlying mechanisms of diseases. Additionally, peripheral blood research may also involve exploring the immune system and its response to various challenges, such as infections, allergies, or autoimmune disorders. Overall, peripheral blood research plays a crucial role in advancing our understanding of human health and disease.