Meiosis is the process by which a single diploid cell produces four haploid cells, each carrying one copy of each chromosome. In males, all four of these haploid cells become sperm, whereas, in ...

Cultural ecosystem services (ES) are consistently recognized but not yet adequately defined or integrated within the ES framework. A substantial body of models, methods, and data relevant to cultural ...

As early-career researchers, we are acutely aware that while behavioral science research typically focuses on Western populations, it aims to draw universal conclusions about human behavior. We were ...

We thank Ping Chun (Gloria) Wu from the Department of Laboratory Medicine and Sudip Ghosh from the Department of Experimental Medical Science, both at the Lund Stem Cell Center, Faculty of Medicine, ...

Igor Dawid in his office at the NIH in 1996. Igor joined the National Cancer Institute (NCI) at the NIH, Bethesda, MD, in 1978. He became head of the Section on Developmental Biology at the National ...

As a signatory to the San Francisco Declaration on Research Assessment, PNAS is invested in improving the evaluation of scholarly research outputs. We track a range of article and journal metrics, ...

Large volumes of liquid water transiently existed on the surface of Mars more than 3 billion years ago. Much of this water is hypothesized to have been sequestered in the subsurface or lost to space.

PNAS is one of the world's most-cited and comprehensive multidisciplinary scientific journals, publishing more than 3,500 research papers annually. The Proceedings of the National Academy of Sciences ...

PNAS publishes exceptional research in all branches of the biological, physical, and social sciences. In addition to research, PNAS publishes Front Matter, Perspectives, and more.

Edited by Lawrence Goldstein, University of California at San Diego, La Jolla, CA; received June 16, 2024; accepted July 16, 2024 ...

Maria A. Holland et al.