pnas

# PNAS — Author Guideline Skill **Publisher:** National Academy of Sciences · **Verified:** 2026-07 · Confirm exact limits at the PNAS author center. ## Aims & scope Multidisciplinary — biological, physical, and social sciences; food, nutrition, agriculture, microbiology, and environmental work all in scope. ## Format (PNAS style) - **References: numbered** in order of citation (PNAS style); numbered reference list with article titles and DOIs. > 1. A. B. Author, C. D. Author, Title of the article. *Proc. Natl. Acad. Sci. U.S.A.* **123**, e2412345 (2026). - **Significance Statement (mandatory):** a plain-language paragraph for non-specialists, ~120 words (confirm limit). - **Abstract:** ≤250 words, unstructured. - **Structure:** Title → Author affiliations → Significance Statement → Abstract → Introduction → Results → Discussion → Materials and Methods → References. Research Reports/Articles have length guidance (confirm). - **Mandatory:** data availability statement; author contributions; competing interest statement. - **Figures:** ≥300 dpi; RGB/CMYK per policy; one/two-column widths; editable tables. ## Formatting constraints ```yaml journal: PNAS publisher: National Academy of Sciences reference_style: pnas-numbered significance_statement: {required: true, words: 120} abstract_words: 250 data_availability: required figure_dpi: 300 ```