. "\"The process in which an antigen-presenting cell expresses antigen (peptide or polysaccharide) on its cell surface in association with an MHC class II protein complex.\" [GOC:add, ISBN:0781735149, PMID:15531770, PMID:15771591, PMID:16153240]" . . "antigen processing and presentation of peptide or polysaccharide antigen via MHC class II" . "peptide or polysaccharide antigen processing and presentation of via MHC class II" . .