Genetic studies on Jews related they were through IBD. Individuals within the Ashkenazi, Sephardi, and Mizrahi groups shared high levels of IDB, roughly equivalent to that of fourth or fifth cousins. All three groups shared many genetic features, suggesting a common origin dating back more than 2,000 years. The study did find that all three Jewish groups did show various signs of admixture with non Jews, with the genetic profiles of Ashkenazi Jews indicating between 30% and 60% admixture with Europeans, although they clustered more closely with Sephardi and Mizrahi Jews. In July 2010, Bray et al., using SNP microarray techniques and linkage analysis,
Ashkenazi Hebrew eastern, e.g. Eastern Syriac "Peshitta" as against Western Syriac "Peshito". Ashkenazi Hebrew in its written form also resembles Palestinian Hebrew in its tendency to "male" spellings (see Mater lectionis). Others, including Abraham Zevi Idelsohn, believed that the distinction is more ancient, and represents the distinction between the Judaean and Galilean dialects of Hebrew in Mishnaic times (1st−2nd centuries CE), with the Sephardi pronunciation being derived from Judaean and the Ashkenazi from Galilean. This theory is supported by the fact that Ashkenazi Hebrew, like Samaritan Hebrew, has lost the distinct sounds of many of the guttural letters, while there are references