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[[Image:LH B cells Peyers Patch Histology.jpg|right|thumb|150px|<p>'''B Cells in Lymph node'''</p>^{©RVC 2008}]]

[[Image:LH B cells Peyers Patch Histology.jpg|right|thumb|250px|<p>'''B Cells in Lymph node'''</p>^{©RVC 2008}]]

''Also called B lymphocytes''

Also known as '''''B lymphocytes

<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.

<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.

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>

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>