Table 1.

Comparison of features available in PubMed, PubMed Mobile and PubMed Labs. The + sign denotes a significant improvement of the feature in PubMed Labs compared to the current PubMed. AMA, MLA and APA stand for citation formats American Medical Association, Modern Language Association and American Psychological Association, respectively

Feature	PubMed	PubMed Mobile	PubMed Labs
Results by year (Figure 1d)Bar chart with columns representing the number of articles for the entered query every year.	Yes	No	Yes+Possibility to select specific time periods
Search facets (Figure 1e)Filters to quickly narrow down the results (e.g. publication date).	Yes	Partially (10)	Partially (12)
Snippets (Figure 1f)Useful highlighted text fragments from the article abstract that are selected based on their relatedness with the user query.	No	No	Yes
Related searches (Figure 1g)Suggested queries close to the one entered by the user.	Yes	Yes	Yes
Abstract formatSearch results can be displayed with more information, e.g. abstract.	Yes	No	Yes+ Number of PMC citations, references and figures
Article figures (Figure 2i)Figures in the article when available.	Yes	No	Yes+Full screen carousel, better user interaction
Citation data (Figure 2k)An easy access to various citation formats (AMA, MLA, APA).	No	No	Yes
Article navigation (Figure 2m)List of sections of an article with a pointer on the current section.	No	No	Yes
Similar articles (Figure 2n)A list of articles related to the one displayed.	Yes	Yes	Yes+More details, more standing out
Next/previous articleLinks allowing to skim through the results without going back and forth to the search results page.	No	Yes	Yes
Advanced search pageA page containing various tools (e.g. query builder, search history) to help more advanced users design their complex queries.	Yes	No	No
MyNCBIA collection of features (e.g. saving sets of articles) available after logging in.	Yes	No	No