Categories: Wikipedia articles needing copy edit from September 2007 | All articles needing copy edit | Leukocytes | Immunology stubs Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte. ... Blood plasma is the liquid component of blood, in which the blood cells are suspended. ... Sketch of bone marrow and its cells Pluripotential hemopoietic stem cells (PHSCs) are stem cells found in the bone marrow. ... A scanning electron microscope (SEM) image of a single human lymphocyte. ... A scanning electron microscope image of normal circulating human blood. ... T cells are a subset of lymphocytes that play a large role in the immune response. ... A cytotoxic T cell (also known as TC, CTL or killer T cell) belongs to a sub-group of T lymphocytes (a type of white blood cell) which are capable of inducing the death of infected somatic or tumor cells; they kill cells that are infected with viruses (or other... This article or section does not cite its references or sources. ... Regulatory T cells (also known as suppressor T cells) are a specialized subpopulation of T cells that act to suppress activation of the immune system and thereby maintain immune system homeostasis and tolerance to self. ... γδ T cells represent a small subset of T cells that possess a distinct T cell receptor (TCR) on their surface. ... Natural killer T cells (NK T cells) are a type of lymphocyte, or white blood cell. ... B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response). ... Plasma cells (also called plasma B cells or plasmocytes) are cells of the immune system that secrete large amounts of antibodies. ... Memory B cells are a B cell sub-type that are formed following primary infection. ... Natural NK cells are cytotoxic; small granules in their cytoplasm contain special proteins such as perforin and proteases known as granzymes. ... In cell biology, a lymphokine-activated killer cell (also known as a LAK cell) is a white blood cell that has been stimulated to kill tumour cells. ... Myeloid cells is a subsummating term for all hemopoietic cells except the lymphoid ones (T-cells, B-cells, NK-cells, dendritic cells). ... A scanning electron microscope image of normal circulating human blood. ... Eosinophil granulocyte Basophil granulocyte Granulocytes are a category of white blood cells characterised by the presence of granules in their cytoplasm. ... This article does not cite any references or sources. ... Image of an eosinophil Eosinophil granulocytes, commonly referred to as eosinophils (or less commonly as acidophils), are white blood cells of the immune system that are responsible for combating infection by parasites in vertebrates. ... This article or section does not cite its references or sources. ... Mast cells A mast cell (or mastocyte) is a resident cell of areolar connective tissue (loose connective tissue) that contains many granules rich in histamine and heparin. ... Dendritic cells (DC) are immune cells and form part of the mammal immune system. ... Langerhans cells are immature dendritic cells containing large granules called Birbeck granules. ... Dendritic cells (DC) are immune cells and form part of the mammal immune system. ... Monocyte A monocyte is a leukocyte, part of the human bodys immune system that protect against blood-borne pathogens and move quickly to sites of infection in the tissues. ... A macrophage of a mouse stretching its arms to engulf two particles, possibly pathogens Macrophages (Greek: big eaters, makros = long, phagein = eat) are white blood cells, more specifically phagocytes, acting in the nonspecific defense as well as the specific defense system of vertebrate animals. ... A Histiocyte is a cell that is part of the human immune system. ... Kupffer cells or Browicz-Kupffer cells are specialized macrophages located in the liver that form part of the reticuloendothelial system. ... Langhans giant cells are large cells found in granulomatous conditions. ... Microglia cells positive for lectins Microglia are a type of glial cell that act as the immune cells of the Central nervous system (CNS). ... An osteoclast (from the Greek words for bone and broken) is a type of bone cell that removes bone tissue by removing the bones mineralized matrix. ... A megakaryoblast is a precursor cell to a promegakaryocyte, which in turn becomes a megakaryocyte. ... The megakaryocyte is a bone marrow cell responsible for the production of blood platelets when its cytoplasm becomes fragmented. ... A 250 ml bag of newly collected platelets. ... Myeloid cells is a subsummating term for all hemopoietic cells except the lymphoid ones (T-cells, B-cells, NK-cells, dendritic cells). ... Human red blood cells Red blood cells are the most common type of blood cell and the vertebrate bodys principal means of delivering oxygen from the lungs or gills to body tissues via the blood. ... Reticulocyte Erythrocyte Reticulocytes are immature red blood cells, typically comprising about 1% of the red cells in the human body. ... A normoblast (or erythroblast) is a type of red blood cell which still retains a cell nucleus. ... A scanning electron microscope image of a single neutrophil (yellow), engulfing anthrax bacteria (orange). ... Immunology is a broad branch of biomedical science that covers the study of all aspects of the immune system in all organisms. ... The immune system is the collection of organs and tissues involved in the adaptive defense of a body against foreign biological material. ... The innate immune system comprises the cells and mechanisms that defend the host from infection by other organisms, in a non-specific manner. ... Humoral immunity is the aspect of immunity that is mediated by secreted antibodies, produced in the cells of the B lymphocyte lineage (B cell). ... Cell-mediated immunity is an immune response that does not involve antibodies but rather involves the activation of macrophages and NK-cells, the production of antigen-specific cytotoxic T-lymphocytes, and the release of various cytokines in response to an antigen. ... A complement protein attacking an invader. ... Anaphylatoxin, or anaphylotoxin, is a fragment (C3a, C4a or C5a) of the complement system that triggers degranulation of (release of substances from) mast cells or basophils, which is an important part of the immune system in all kinds of inflammation and especially as part of defense against parasites. ... Each antibody binds to a specific antigen; an interaction similar to a lock and key. ... // Monoclonal antibodies (mAb) are antibodies that are identical because they were produced by one type of immune cell and are all clones of a single parent cell. ... Polyclonal antibodies are antibodies that are derived from different B-cell lines. ... An autoantibody is an antibody (a type of protein) manufactured by the immune system that is directed against one or more of the individuals own proteins. ... The allotype affects the constant region (labeled CL and CH1-3 in the diagram. ... In immunology, the immunoglobulin isotype refers to the type of chain. ... The idiotype affects the variable region (labeled VL and VH in the diagram. ... This article does not cite any references or sources. ... Superantigens (SAgs) are a group of virulent toxins that indiscriminately activate T-cells of the immune system causing system-wide inflammation and other serious, potentially fatal symptoms. ... A scanning electron microscope image of normal circulating human blood. ... T cells are a subset of lymphocytes that play a large role in the immune response. ... B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response). ... Natural killer cells (NK) are a type of lymphocyte (a white blood cell) and a component of nonspecific immune defense. ... Mast cells A mast cell (or mastocyte) is a resident cell of areolar connective tissue (loose connective tissue) that contains many granules rich in histamine and heparin. ... Categories: Wikipedia cleanup | Biology stubs | Blood and immune system cells ... Eosinophils are white blood cells that are responsible for combating infection by parasites in the body. ... Neutrophil granulocytes (commonly referred to as neutrophils) are a class of white blood cells and are part of the immune system. ... A macrophage of a mouse stretching its arms to engulf two particles, possibly pathogens Macrophages (Greek: big eaters, makros = long, phagein = eat) are white blood cells, more specifically phagocytes, acting in the nonspecific defense as well as the specific defense system of vertebrate animals. ... Dendritic cells (DC) are immune cells and form part of the mammal immune system. ... An antigen-presenting cell (APC) is a cell that displays foreign antigen complexed with MHC on its surface. ... The reticuloendothelial system (RES), part of the immune system, consists of the phagocytic cells located in reticular connective tissue, primarily monocytes and macrophages. ... Immunity is a medical term that describes a state of having sufficient biological defenses to avoid infection, disease, or other unwanted biological invasion. ... Autoimmunity is the failure of an organism to recognize its own constituent parts (down to the sub-molecular levels) as self, which results in an immune response against its own cells and tissues. ... An allergy is an abnormal, acquired sensitivity to a given substance, including pollen, drugs, or numerous environmental triggers. ... Immune or immunological tolerance is the process by which the immune system does not attack an antigen. ... Central tolerance is a condition caused by tumor cells caused by tumor antigens inhibiting the immune system which has no reaction. ... In medicine, immune deficiency (or immunodeficiency) is a state where the immune system is incapable of defending the organism from infectious disease. ... Immunogenetics is the branch of medical research that explores the relationship between the immune system and genetics. ... This article needs to be cleaned up to conform to a higher standard of quality. ... V(D)J recombination is a mechanism of DNA recombination used by humans and other vertebrates for immunological protection against attacks by bacterial, viral, and parasitic invaders. ... Immunoglobulin class switching (or isotype switching) is a mechanism by which the constant region of a heavy chain changes. ... MHC I (1hsa) vs MHC II (1dlh) (more details. ... HLA region of Chromosome 6 The human leukocyte antigen system (HLA) is the name of the human major histocompatibility complex (MHC). ... Cytokines are a group of proteins and peptides that are used in organisms as signaling compounds. ... An abscess on the skin, showing the redness and swelling characteristic of inflammation. ... An opsonin is any molecule that acts as a binding enhancer for the process of phagocytosis, for example, by coating the negatively-charged molecules on the membrane. ...