| Chain | GOid | namespace | contents |
| B | 0002474 | biological_process | antigen processing and presentation of peptide antigen via MHC class I |
| B | 0002503 | biological_process | peptide antigen assembly with MHC class II protein complex |
| B | 0005576 | cellular_component | extracellular region |
| B | 0005765 | cellular_component | lysosomal membrane |
| B | 0006955 | biological_process | immune response |
| B | 0019886 | biological_process | antigen processing and presentation of exogenous peptide antigen via MHC class II |
| B | 0023026 | molecular_function | MHC class II protein complex binding |
| B | 0031902 | cellular_component | late endosome membrane |
| B | 0042605 | molecular_function | peptide antigen binding |
| B | 0042612 | cellular_component | MHC class I protein complex |
| B | 0042613 | cellular_component | MHC class II protein complex |
| B | 0050778 | biological_process | positive regulation of immune response |
| B | 0050870 | biological_process | positive regulation of T cell activation |
