The Required Number of Complexes of a Microbial Peptide and a Particular

question 17

Multiple Choice

The required number of complexes of a microbial peptide and a particular class II MHC allele on the surface of an antigen-presenting cell to initiate a T cell response specific for the viral peptide is:

• A)At least equal to the number of complexes of self peptides with class II MHC on the cell surface
• B)Greater than 10³
• C)Less than or equal to 0.1% of the total number of class II MHC molecules on the cell surface
• D)Greater than 10⁶
• E)Zero

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