T cell dependent B cell activation

T cell dependent B cell activation

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Caption: T cell dependent B cell activation, computer artwork. Invading pathogens (round, small) are phagocytosed (engulfed) by macrophages, a type of white blood cell. Fragments of protein (antigen) from the pathogen are displayed on the macrophage's surface. The antigen is recognised by helper T lymphocytes (centre right), which secrete chemicals to activate other immune cells, including B lymphocytes (centre left). The B lymphocytes differentiate into plasma cells (large cells bottom right), which produce large numbers of antibodies (y-shaped) that recognise the antigen. The antibodies either neutralise the pathogen or flag it for destruction by other cells.

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Keywords: activating, activation, anatomy, antibodies, antibody, artwork, b cell, b lymphocyte, biological, biology, black-and-white, cell mediated immunity, cells, colouring, defence, human body, humoral immunity, illustration, immune response, immune system, immunology, infection, lymphocyte, lymphocytes, macrophage, macrophages, monochrome, pathogen, plasma cell, t cell, t cell dependent activation, t dependent activation, t lymphocyte, wbc, wbcs, white blood cell

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