Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
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.
