Sephardi Jews other, based upon such features as physical traits and culture. In some instances, Sephardi Jews have joined Ashkenazi communities, and have intermarried. Sephardic Jews are genetically related closely to their Ashkenazi Jewish counterparts as both diverged from the same cluster of ancient Iraqi and Iranian Jews approximately 2,500 years ago. Due to their origin in the Mediterranean basin, there is a higher incidence of certain hereditary diseases and inherited disorders in Sephardi Jews. However, there are no specifically Sephardic genetic diseases, since the diseases in this group are not common to Sephardic Jews in general, but are instead common in
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