b Presentation of Ags by B cells to Th cells B cells that bind protein ags by their BCR endocytose these Ags, process them in endosomal vesicles, display mhc il peptides for recognition of Th cells. B cells and th cells recognize different epitopes of the same protein Ag.b. Presentation of Ags by B cells to Th cells  B cells that bind protein Ags by their BCR endocytose these Ags, process them in endosomal vesicles, display MHC II￾peptides for recognition of Th cells.  B cells and Th cells recognize different epitopes of the same protein Ag