images of abstracts

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All Abstract background photos are available in JPG, AI, EPS, PSD and CDR format.

Authors may upload an image file prepared according to the journal’s figure instructions. The figure should constitute a single image, without distinct lettered parts and without a separate legend. In general, information should flow either from left to right or top to bottom. Data figures are not permitted as graphical abstracts. A schematic model figure from the article itself may be used as the graphical abstract. The following specifications are recommended:
A graphical abstract is a single schematic image that visually represents the primary findings of an article, allowing readers to easily identify the article’s main message. The graphical abstract appears at the top of the online version of the article.

References:

http://pixabay.com/images/search/abstract/
http://pngtree.com/free-abstract-background
http://www.jci.org/kiosks/publish/graphical