cylclase | 
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| navigate by keyword : adenylyl antigen atp blood camp cascade cell complex cylclase defense gtp helper histocompatibility immune immunization lymphocyte major membrane mhccomplex molecules protein receptor signal system transduction white		 | 
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| Activation of the T-cell receptor violet, lef through the presentation of an antigen molecule green by MHC -2 red. A G-alpha subunit of a G-protein blue gets then activated through GTP yellow binding and activates the adenylyl cylclase violet, right, which produces c-AMP red, highlighted out of ATP. Source: PDB entries 1jl4,  1fyt, 6r3q | 
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