As another example, she points to work by Thomas et al., who sought to distinguish between the Y chromosomes of Jewish priests (Kohanim), (in Judaism, membership in the priesthood is passed on through the father's line) and the Y chromosomes of non-Jews. Abu el-Haj concluded that this new "race science" calls attention to the importance of "<answer>ancestry</answer>" (narrowly defined, as it does not include all ancestors) in some religions and in popular culture, and people's desire to use science to confirm their claims about <answer>ancestry</answer>; this "race science", she argues, is fundamentally different from older notions of race that were used to explain differences in human behaviour or social status:
What does the new "race science" call attention to the importance of?
ancestry