Instructions for typesetting manuscripts:

All publications will be in English. Authors should prepare their manuscripts to be written in idiomatic English.

All manuscript should be prepared in double space. The standard order of sections in the manuscript file is: title page, abstract, introduction, materials and methods, results, discussion, acknowledgements, references, figure legends, figures, and tables.

Title Page. Include the following information on this page: The title of the manuscript, list of all authors and their affiliations, contact information including e-mail address of the corresponding authors.

Abstract. Provide an abstract of no more than 250 words on page 2 of the manuscript. Abstracts should explain to the general reader the major contributions of the article. References in the abstract must be cited in full.

Text. Describe procedures in sufficient detail so that the work can be repeated. Methods must be presented before Results and Discussion. Follow the spelling and usage given in Webster's Third New International Dictionary or the Random House Dictionary of the English Language. Avoid laboratory jargon. Correct chemical names should be given and strains of organisms should be specified. Trade names should be identified by an initial capital letter with the remainder of the name lowercase. Names and addresses of suppliers of uncommon reagents or instruments should be provided. Use Système International (SI) units and symbols whenever possible. When SI units are not used, the factor for conversion should be provided on first usage.

Footnotes. Use symbols in the order *, , , §, ¶, , **, , , §§, ¶¶. Acknowledgments. List dedications, acknowledgments, and funding sources. References.

References must be in Proceedings of National Academy of Science (PNAS) style. Only published or in-press papers and books may be cited in the reference list. Abstracts of papers presented at meetings are not permitted. References should be cited in numerical order as they appear in text. Because tables and figures will be inserted in the text where first cited, references in these sections should be numbered accordingly. All authors (unless there are 10 or more) should be named in the citation. If 10 or more, list the first 10 names followed by et al. Databases are cited in the text or as footnotes.