I agree with and support the finding that an increase in the proportion of female mentors is associated not only with decreased post-mentorship impact of women's protégé, but also with reduced retention of female mentors. While current diversity policies encourage same-sex mentoring to retain women in academia, our findings raise the possibility that opposite-sex mentoring may actually increase the impact of women pursuing scientific careers. These findings add new perspective to the policy debate about how best to elevate the status of women in science.
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