What does the CD4 co-receptor on the T cell bind to?

Question

Accepted Answer

The β2 domain of the MHC class II molecule to strengthen the binding between the T cell and antigen presenting cell

Answer

Both the MHC and peptide in the peptide:MHC complex to strengthen the binding between the T cell and antigen presenting cell

Answer

The peptide in the peptide:MHC complex to strengthen the signals delivered by the antigen presenting cell

Answer

The α1 domain of the MHC class II molecule to strengthen the signals delivered by the antigen presenting cell

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