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Message: <blockquote data-quote="imhotep" data-source="post: 28176766" data-attributes="member: 562115">T cells are involved in the cell-mediated immune response, whereas B cells are part of the humoral immune response. B cells are activated when their B cell receptor (BCR) binds to an antigen.B cells are of  two main types.  A T-Independent immune response B cells which can respond directly to the antigen, and a T-Dependent immune response type that needs assistance from T cells in order to respond.Naïve T cells can express one of two different molecules, classified as CD4+ or CD8+ cells.  Helper T cells are CD4+, while cytotoxic T cells are CD8+.  Helper T cells release cytokines while cytotoxic T cells kill the infected cell.The above is a short answer for basic biology. The actual signalling is much more complicated and you need to read a textbook on Immunology.PS: A better explanation is in this video.  If any grad student needs a pdf of an immunity textbook pls contact.[MEDIA=youtube]xaz5ftvZCyI[/MEDIA]</blockquote>

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