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PSCPL position 9 sublibrary analysis of the SLA-1*0401 peptide-binding motif. The amino acids valine, serine, and threonine are disfavored in position 9, evident by a decrease in affinity compared to the reference peptide (X9), whereas the large and bulky amino acids tryptophan and tyrosine are favored as seen by an increase in affinity compared to the reference peptide
