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.
Biosynthesis pathway from protoporphyrin IX to chlorophyllide a. Bacterial genes coding for biosynthesis enzyme subunits are indicated by an asterisk. Isocyclic ring formation may proceed via an aerobic and/or an anaerobic mechanism, depending on the organism considered, involving various intermediates not detailed here (for a review, see reference 3).
