They do not require abstracts.Ĭommentaries call attention to articles of particular note. Submissions should be approximately 1,500–2,000 words, not including references. Submissions deemed appropriate for the section are reviewed by at least one NAS member, or other expert, who has the relevant expertise. All authors are welcome to submit proposals for consideration. The argument should be explicitly stated early on in the piece. Authored by researchers, Opinion pieces further the discourse on a timely topic, or offer a call to action, via a clearly articulated argument that includes novel ideas or proposals. Opinions are succinct essays that appear in the Front Matter section. Letters must be submitted within 6 months of the first online publication date of the subject article.Letters may not include references to submitted papers or unpublished results, requests to cite the Letter writer's work, accusations of misconduct, calls for retraction, or personal comments to an author.Legends should only include brief descriptions of the figures. Letters are limited to 500 words, 2 graphical elements (figures or tables), and 10 references.Letters to the Editor provide brief comments that allow readers to constructively address a difference of opinion with authors of a PNAS article. All Brief Reports follow the Direct Submission mode of review and are not eligible as member-contributed submissions.Supporting information (SI) is limited to extended methods, essential supporting datasets, and videos (no additional tables or figures).Brief Reports are limited to 3 pages, which is approximately 1,600 words (including the manuscript text, title page, abstract, and figure legends), and 15 references.
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