Antigen uptake and processing of exogenous proteins is critical for adaptive immunity. particularly for T helper cell activation. Proteins undergo distinct proteolytic processing in endolysosomal compartments of antigen-presenting cells. The resulting peptides are presented on MHC class II molecules and specifically recognized by T cells. https://www.nacrack.com/deal-alert-Dea-Eyewear-Jemma-deal-zone/