Distribution of OpenPMC data by subdomain. OpenPMC word count for the subdomains we consider: green coloring indicates data mapped to a single subdomain, orange indicates two subdomains, and red indicates three or more. In this study we only use data mapped to a single subdomain.
Lippincott et al. BMC Bioinformatics 2011 12:212 doi:10.1186/1471-2105-12-212