Figure 4.
HPLC chromatogram of (A) extracted blank (drug-free) human serum containing 13-cis retinoic acid (IS); (B) extracted human serum containing crocetin and 13-cis retinoic acid (IS)
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.