In: Biology
different between MHC class 1 and MHC class 2 (Table)
| MHC class I | MHC class II | |
| Types of antigen presenting cells | These are present in all nucleus cells | 
 These are present on specialised APCs like macrophages, bacteria and dendritic cells.  | 
| Peptide size and structure | Contains 8 to 10 amino acids and consist of one membrane spanning alpha chain. | Contains 14 to 20 amino acid and consist of two membrane chains alpha and beta of similar size.. | 
| T cells response | These are present on the cytotoxic T cells lymphocytes including CD 8 and T cells. | These are present to helper T cells lymphocytes of CD4 and T cells | 
| Coreceptors responsible | Bind with CD8 coreceptors cytotoxic T cells. | Binds with CD4 of helper T cells | 
| Enzyme responsible to peptide generation | Cytosolic proteasomes | Endosomal and lysosomal proteases. | 
| Site of peptides loading | Endoplasmic reticulum | vesicular compartment | 
| Presentation of foreign antigens | Intracellular | Extracellular | 
| Final outcomes | Target cell for destruction | Induces antibody production. |