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Which cell works as a dual receptor in CTLs?

Which cell works as a dual receptor in CTLs? Correct Answer CD8

In CTLs the CD8 molecule has two functions as a receptor 1) recognizing the ligand. (MHC molecules OR non-antigen specific ligands are served for the TCR) 2) initiating signal transduction (signal transduction in CTLs can be initiated by interactions of CD8 and MHC class 1) Due to double functionality of CD8 it is also referred to as a dual receptor. 

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