Established in 1914, PNAS publishes cutting-edge research, science news, Commentaries, Perspectives, Colloquium Papers, Reviews, and actions of the NAS. The journal's content spans the biological, physical, and social sciences and is global in scope.Nearly half of all accepted papers come from authors outside the United States.
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PNAS makes all content free within 6 months of publication and immediately free in 119 developing countries.Authors who choose the PNAS open access option pay a surcharge to make their papers immediately free.PNAS is abstracted and/or indexed in, for example: CABI, Chemical Abstracts Service, Current Contents Connect, EBSCO PNAS supports the following initiatives: PNAS deposits content in Cross Check, a Cross Ref initiative to help scientific publishers engage in efforts to prevent plagiarism.Cross Check has a continuously growing database of current and archival scholarly literature.Cross Mark is a Cross Ref initiative to provide a standard way for readers to locate the authoritative version of a document.The Cross Mark logo means that PNAS is committed to maintaining the content it publishes and to alerting readers to changes when they occur.Clicking on the Cross Mark logo will provide the current status of a document and any additional publication record information.PNAS participates in Fund Ref, a Cross Ref initiative to provide a standard way of reporting funding for published research.To see if a PNAS paper has Fund Ref data, click on the Cross Mark logo that appears with the paper, and select the Record tab.ORCID provides a persistent digital identifier that distinguishes you from every other researcher and, through integration in key research workflows such as manuscript and grant submission, supports automated linkages between you and your professional activities ensuring that your work is recognized.PNAS strongly encourages all authors to use their ORCID identifier when submitting papers. CHORUS is a CHOR, Inc., initiative to give agencies and publishers a sustainable method for giving the public access to funded research. PNAS has been a member of the Committee on Publication Ethics (COPE) since 2008 (JM00047) and supports its core practices.