How is heme biosynthesis by immature red cells?

In mitochondria (glycine and succinyl CoA acted on by ALA synthase and vitamin B6 to form ALA, which will become protoporphyrin, which combines w/ iron from ferritin or transferrin coming from cytosol to become Heme) In cytosol (Globin chains are formed by translation, combines w/ heme to make hemoglobin tetramer)