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2. Lymphocyte - Wikipedia

   en.wikipedia.org/wiki/Lymphocyte

   A lymphocyte is a type of white blood cell (leukocyte) in the immune system of most vertebrates. [1] Lymphocytes include T cells (for cell-mediated and cytotoxic adaptive immunity), B cells (for humoral, antibody-driven adaptive immunity), [2] [3] and innate lymphoid cells (ILCs; "innate T cell-like" cells involved in mucosal immunity and homeostasis), of which natural killer cells are an ...

3. Foreground and background - Wikipedia

   en.wikipedia.org/wiki/Foreground_and_background

   Foreground and background in photography and cinematography, a principle important for Depth of field, the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image; Deep focus, a technique using a large depth of field; Fill flash, to correctly expose the foreground and background objects

4. File:Logo of the Ministry of Health of the Republic of ...

   en.wikipedia.org/wiki/File:Logo_of_the_Ministry...

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