Fig. 3.
Trend analysis of reports indexed in “PubMed” database with keywords “Alkannin” and “Shikonin” from 1951 to 2021.
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.