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<p>would also be presented, allowing the immune system to recognize and kill the infected cell. Worn out proteins within the cell become <a href="page.php?w=ubiquitin">ubiquitin</a>ated, marking them for <a href="page.php?w=proteasome">proteasome</a> degradation. Proteasomes break the protein up into peptides that include some around nine amino acids long (suitable for fitting within the peptide binding cleft of MHC class I molecules). <a href="page.php?w=Transporter_associated_with_antigen_processing">Transporter associated with antigen processing</a></p><p>
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