Microbiology The peptide binding site on Class I MHC molecules is located in: A Proximal domain of a subunits B Distal domain of a subunit C Proximal domains of a and p subunit D Distal domains of a and p subunit 💡 Explanation The peptide binding site on Class I MHC molecules is located in: ✓ Correct Answer: B. Distal domain of a subunit