have to teach pretty a SES the cleve in invariant chain into places leaving small peptide the class to associate invariant chain peptide or clip down to the class 2 molecule engulfed pathogens where their protein are also degraded by ass inactivated pretty aces into peptide these cannot immediately buy into the class 2 molecule because the clip peptide still occupies the peptide binding grew the removal and the clip peptide is the function at the specialized MHC class to like molecule Hl a DM which is also present in these vesicles it function as a catalyst coordinating both the release obliquely peptide from Class two molecule and the binding a pathogen derived peptide the MHC class to peptide complex is then transported to the cell surface where it can be recognized by the antigen receptor CD4+ T cell