Update: Vijaysree Venkatraman's Science Careers article does a good job of placing the PNAS study within the larger context of recent discussions about gender bias in STEM fields [Thanks to Madrasi for the comment-alert].
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Scott Jaschik in Inside Higher Ed: Are the Stars Sexist. The 'stars' in the title are the academic elite of the male kind in biology departments in US research institutions.
... Men are less likely than are women to hire female graduate students and postdocs. And of particular concern, men who have achieved elite status by virtue of awards they have won -- in other words, the men whose labs may be the best launching pads for careers -- are the least likely to hire women who are grad students and postdocs.