Primary biosynthesis sites are the liver and the bone marrow.
Heme iron
It's iron that is found in plants rather than animals. Animal product iron is called heme iron.
Heme is a ferrous ion prosthetic group (Fe2+) present in metalloproteins or specifically Hemoproteins such as Hemoglobin, porphyrin. heme is also found in proteins such as myoglobin, catalase, cytochromes. In these proteins Heme either participates in the catalysis or act as a stabilizer of active site amino acid.
Heme Iron
Heme iron is much more absorbable than non-heme iron. Since the iron inanimal-based foods is about 40% heme iron and 60% non-heme iron, animal-basedfoods are good sources of absorbable iron. In contrast, all of the iron found in plantbasedfoods is non-heme iron. Meat, fish, and poultry also contain a special meatfactor that enhances the absorption of non-heme iron. Vitamin C (or ascorbic acid)also enhances the absorption of non-heme iron.
A heme protein found in straited skeletal and cardiac muscles
Heme prosthetic group or Fe-protoporphyrin ix. A heme is madeup of protoporhyrin (ix) (organic compound) and Fe+2 (metal) hence organometallic.
Heme + globin is Hemoglobin.
Heme is decomposed into iron and biliverdin
Heme iron comes from animal sources, while non-heme iron comes from plant sources, so I believe that because mussels are animals, mussels therefore do contain heme iron. Fish also contains heme iron.
When heme levels are low, more delta-aminolevulinic acid (ALA) synthase are produced. Causing larger quantities of heme precursors to be fed into the biosynthesis path producing more heme.
Much of the heme biosynthesis pathway is dedicated to constructing the porphyrin molecule.