this work shows that Jews are a single ethnic group, in the sense that the major Jewish communities are typically more closely related to each other than to their neighbors. This does not mean that they share no ancestry with their immediate neighbors, but rather that intermarriage with their neighbors has had only a modest impact on the genetic makeup of most Jewish communities. That may be because the rate of intermarriage has been very low, or because intermarriage normally resulted in a loss of affiliation with the Jewish community. There are some Jewish communities which are an exception to this, and are probably descended mostly from local converts, the most obvious example being the Jews of Ethiopia (see below). However, the results are consistent with bulk of Jewish community having its origins in the Eastern Mediterranean.