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Category:Lymphocytes (view source)

Revision as of 14:26, 13 August 2010

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==[[T cells]]==
 
==[[T cells]]==
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[[Image:LH B cells Peyers Patch Histology.jpg|right|thumb|150px|<p>'''B Cells in Lymph node'''</p><sup>©RVC 2008</sup>]]
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==B Cells==
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==[[B cells]]==
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''Also called B lymphocytes''
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<p>So named as they were initially found in the [[Bursa of Fabricius - Anatomy & Physiology|Bursa of Fabricius]]. They produce antibodies (Ig’s) and are associated with humoral immunity. They represent 20-30% of circulating lymphocytes.
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B cells have B cell receptors (BCR), or antigen binding sites. This is [[IgM]] when the B cell is immature, changing to [[IgD]] when the cell is mature. B cells also express MHC II, CD9, CD,19, CD20 and CD24.</p>
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<p>Under antigenic stimulation they differentiate into [[B cell differentiation - WikiBlood#Plasma cells|plasma cells]] and [[B cell differentiation - WikiBlood#Memory cells|memory cells]].</p>
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B-cells also act as Antigen-Presenting Cells (APCs) by presenting digested fragments to T-cells on [[MHC - WikiBlood#MHC II|MHC II]].
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For more on B cell differentiation, see [[B cell differentiation - WikiBlood|here]].
      
==Natural Killer (NK) cells==
 
==Natural Killer (NK) cells==
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