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.
Radical type of sulfur insertion mechanism (BioB catalysis of biotin biosynthesis). (A) Reductive cleavage of SAM. (B) Proposed BioB catalytic mechanism in which thioether bond formation goes through two substrate-based radical intermediates, 19a and 19d.
