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Text replace - "[[MHC - WikiBlood#" to "[[Major Histocompatability Complexes#"
* [[Lymphocytes#T cells|T cells]] function only after recent activation by antigen.
* [[Lymphocytes#T cells|T cells]] function only after recent activation by antigen.
* CD4 binds [[MHC - WikiBlood#MHC II|MHC class II]].
* CD4 binds [[Major Histocompatability Complexes#MHC II|MHC class II]].
** [[Lymphocytes#Helper CD4+|CD4+ T-cells]] therefore recognise antigen only in association with [[MHC - WikiBlood#MHC II|MHC class II]]
** [[Lymphocytes#Helper CD4+|CD4+ T-cells]] therefore recognise antigen only in association with [[Major Histocompatability Complexes#MHC II|MHC class II]]
* CD8 binds [[MHC - WikiBlood#MHC I|MHC class I]].
* CD8 binds [[Major Histocompatability Complexes#MHC I|MHC class I]].
** [[Lymphocytes#Cytotoxic CD8+|CD8+ T-cells]] recognise antigen only in association with [[MHC - WikiBlood#MHC I|MHC class I]].
** [[Lymphocytes#Cytotoxic CD8+|CD8+ T-cells]] recognise antigen only in association with [[Major Histocompatability Complexes#MHC I|MHC class I]].
* Activation of [[Lymphocytes#T cells|T cells]] requires two distinct signals.
* Activation of [[Lymphocytes#T cells|T cells]] requires two distinct signals.
** '''Signal 1'''
** '''Signal 1'''