“The Portuguese have a characteristic unique among world populations: a high frequency of HLA-A25-B18-DR15 and A26-B38-DR13…According to an early genetic study, the Portuguese are a relatively distinct population according to HLA data, as they have a high frequency of the HLA-A25-B18-DR15 and A26-B38-DR13 genes. The latter is a unique Portuguese marker – the Portuguese have neither a significant contribution to their genetic pool from paleo-North Africans (A30-B18) nor Mediterraneans (A33-B14). As such, they may have remained in relative genetic isolation compared to the rest of the Iberian populations. In Europe, the A25-B18-DR15 gene is only found in Portugal..” https://en.wikipedia.org/wiki/Portuguese_people
