Tabitha M. Powledge calls the U.S. National Library of Medicine's database PubMed the "single basic irreplaceable tool for research in the life sciences." In her weekly blogs roundup, she discusses the new PubMed Commons, which allows comments on journal abstracts. There's good news and bad in this, Powledge writes: It's a clear step forward for post-publication peer review, but the system tightly restricts who can register and comment.
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