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Leucocyte
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[[File:Leucocyte types.jpg|thumb|400x400px|Types of Leucocytes. Source: University of Michigan Webscope.]] '''Leucocytes''' or '''leukocytes''', colloquially known as white blood cells (WBCs), are clear, colorless cells that circulate in the [[blood]] and [[lymph]] and are integral part of the [[immune system]].<ref>{{Cite journal | title = leucocyte|url=http://medical-dictionary.thefreedictionary.com/leucocyte|journal=The Free Dictionary}}</ref> Leucocytes are divided into the types: [[neutrophil]]s, [[eosinophil]]s, [[basophil]]s, [[lymphocyte]]s and [[monocyte]]s. Each of these types has further derivatives, for example [[Natural killer cell]]s are derivative of [[lymphocyte]]s.<ref>{{Cite web|url=https://www.immunology.org/public-information/bitesized-immunology/cells/natural-killer-cells | title = Natural Killer Cells {{!}} British Society for Immunology | website = immunology.org|language=en|access-date=2018-10-09}}</ref> There are two lymphoid tissue types:bibideebeepbop * '''Primary Lymphoid tissues''', comprising the [[bone marrow]] and [[thymus]] where leucocytes are synthesized<ref name="MaleD2007" /> * * '''Secondary lymphoid tissues''', comprising the [[spleen]], [[Lymph node|lymph nodes]] and mucosa associated lymphoid tissues (MALT)<ref name="MaleD2007" /> Secondary lymphoid tissues contain the mature leucocytes that react to infection, triggering an immune response<ref name="MaleD2007" />. ==References== <references> <ref name="MaleD2007">{{citation | author = Male, D | year = 2007 | title = Immunology | publisher = Milton Keynes, The Open University/Milton Keynes, The Open University }}</ref> </references> [[Category:Body systems]] [[Category:Immune cells]] [[Category:Blood components]]
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