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There are two types of proteins that present antigen to T cells: MHC I and MHC II molecules.

All of the following statements are true of both MHC I and MHC II molecules EXCEPT


they exhibit polymorphism in the region that binds to peptides.


they have a glycoprotein heavy chain associated with a small protein light chain.


they contain conserved immunoglobulin structural motifs and as such are classified as members of the immunoglobulin superfamily.


they exhibit peptide binding promiscuity, with each MHC molecule having the ability to bind multiple peptides.

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