Antigen-presenting cells, a class of cells essential to the immune system

Antigen-presenting cells (APCs) Antigen-presenting cells are a class of immune cells that capture antigens, process the antigens and display fragments of the antigen for recognition by T-lymphocytes. Classical antigen-presenting cells are dendritic cells, macrophages, and B-cells. Aside from the classical antigen-presenting cells listed above, a good number of cells of the immune system (e.g. monocytes) […]

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Lymphoid organs play major roles in immune response

Lymphoid organs Lymphatic cells organize into lymphoid tissues and organs of various sizes and structural complexity. These tissues and organs broadly divide into two groups: primary lymphoid organs and secondary lymphoid organs. Lymph filters through many of these lymphoid organs and structures as it travels through lymphatic vessels. The lymphoid organs that play principal roles […]

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Differences between innate host defense and acquired immunity

Innate and acquired arms of immunity work together, as an integrated immune system, to protect us against infections by pathogenic microbes. Interestingly, innate and acquired immune systems have some differences. We shall highlight these differences under the following headings: Speed of response and potency of response Specificity of response Immunological memory Cellular mediators Components Overview […]

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