In 2013, a vaccine policy inadvertently launched a massive natural experiment that would offer new clues about the roots of ...

The authors note, “Apparent image compression artifacts present in SI Appendix, Fig. S6 A and B were questioned by MD Anderson. Due to the age of the paper, we were not able to locate the original ...

Early exposure to microbes has important health effects, leading many researchers to question the value of the “hygiene hypothesis” label. Image courtesy of Shutterstock/Purino. Graph the data points, ...

This work was performed under Contract No. AT(30-1)-1045 with the Division of Biology and Medicine of the Atomic Energy Commission and was supported by a Senior Research Fellowship (SF·97) from the ...

Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not appear immediately following publication. Citation ...

Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not appear immediately following publication. Citation ...

Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not appear immediately following publication. Citation ...

International trade affects global air pollution and transport by redistributing emissions related to production of goods and services and by potentially altering the total amount of global emissions.

The Proceedings of the National Academy of Sciences (PNAS) is committed to providing an accessible experience for all users. We strive to ensure that our website and published content are accessible ...

Journal Club posts are short news stories featuring a recent important, timely journal article selected by one of our Journal Club panelists, who are post-doctoral associates and graduate students in ...

Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not appear immediately following publication. Citation ...

Present address: Research Reactor Institute of Kyoto University, Osaka, Japan. Supported by grant E-1605 of the U.S. Public Health Service and institutional grant IN-4 of the American Cancer Society.