Question: Which of the following is true about antigen capture and presentation? Check all that apply. Question options: a. Mature DC enhance antigen processing and presentation, upregulate costimulatory and secrete cytokines for T cell activation b. DCs not infected by viruses utilize cross presentation to be presented by MHC I to CD8 T cells c. Endogenously synthesized antigens are processed in proteasomes that are transported by TAP to ER, loaded onto MHC I and presented to CD8 T cells d. Cancer cells or virus infected cells that are not professional antigen presenting cells do express costimulatory molecules and secrete cytokines e. Mature DC recognizes antigen without PRR involvement and becomes immature to process antigen and load on MHC to present on T cells f. Exogenous antigen endocytosed by APC are degraded to peptide in endosomes and binds to MHC II after releasing CLIP and expressed on cell surface to be presented to CD4 T cells