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The invariant chain has two crucial functions in the assembly of MHC molecules.

The two functions of the invariant chain are to
Select Option prevent the binding of antigens in the endoplasmic reticulumcreate a non-variable chain to help T cell recognitionanchor the MHC molecule into the cell membrane
and also to
Select Option prevent binding of $\beta$2-microglobulin to the MHCaid in trafficking of the assembled MHC to the endosomal compartmentassist binding to the T cell receptor
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