[Histotypes HL-A in the Ligurian population of the islet San Pietro in Sardinia].

The frequency of 17 HLA antigens of loci A and B has been studied by microlymphocytoxicity test in 114 subjects of islet S. Pietro, very close (a few miles) to South-west of Sardinia, but genetically very different from it, deriving the population from a region (Liguria) of continental Northern Italy. The data have been compared with those of a village of Southern Sardinia and with those of a population living in Liguria (continental Italy). The results confirm the striking genetical difference between people of the two islands (S. Pietro and Sardinia) and the close similarity between S. Pietro and Liguria from the genetical point of view.