Chose one:
CD4 is expressed on lymphocytes to:
Serve as a co-receptor on T-cells to help bind MHC class I
Serve as a co-receptor on T-cells to help bind MHC class II
Serve as a co-receptor on T-cells to help bind CD80/CD86 on antigen presenting cells
Promote attachment of T-cells to integrins on antigen presenting cells
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