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.
Potential major cellular sources in the small intestine (SI, orange), skin (pink), lung (green), tonsile and uterine (yellow), and colon (blue) are shown. Some innate cells in the colon may represent a same linage with different differentiation stages.
