FIG. 4.
Principle of 18O incorporation into the internal α-carboxyl group upon proteolytic cleavage of the polypeptide chain. In the presence of 50% 18O-enriched buffer, 18O incorporation is excluded from the C-terminal peptide.
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.