One of the world's most-cited multidisciplinary scientific serials, the Proceedings of the National Academy of Sciences publishes cutting-edge research reports, commentaries, reviews, perspectives, and colloquium papers spanning the biological, physical, and social sciences. PNAS is published weekly in print and daily online. PNAS Online contains the full text of all articles; access to the current content is available by subscription, but free access is available immediately to selected content as well as to the complete content of all issues six months after their publication in print.

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