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.
A PhenX domain consists of quantitative and qualitative measures with a unifying theme, whereas collections consist of measures with a shared characteristic, target population, or topic. Measures included in a collection may cut across multiple research domains.
