We report here the exon 2 sequence of the novel HLA-DRB1*110403 which differs from DRB1*110401 by a single synonymous nucleotide substitution at codon 78, where TAC is substituted by TAT. The variant originally identified in a Caucasoid individual was confirmed by cloning and sequencing.

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Two novel human leucocyte antigen (HLA) class I alleles were characterized by means of sequencing-based typing techniques. HLA-A*310103 was identified in a cord blood unit from a Caucasoid individual. The sequence of this allele is identical to that of HLA-A*310102 except for a silent mutation in exon 3 at position 480 (G --> A). HLA-B*9531 was found in a Caucasoid female patient registered on the heart transplantation waiting list in the North Italy Transplant programme. This new variant differs from HLA-B*1503 at position 572 (G --> C) in exon 3. This nucleotide change leads to an amino acidic substitution at codon 167 from tryptophan to serine.

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