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.
Chronology for the introduction of different animal biles used therapeutically in traditional Chinese medicine. The main Chinese dynasties are listed to the left of year in 500-year increments to indicate the approximate beginning of the dynasty. BCE: Before the common era; CE: Common era which corresponds to the common Gregorian calendar.
