Biosynthesis of the pigments of life.

Chlorophyll can be chosen as the fundamental pigment of life. Related to it is protoheme, the red pigment of blood. These substances are found to be biosynthesized from the same parent substance called uroporphyrinogen-III. This paper covers research over a period of 19 years, which has gradually revealed the details of Nature's pathway to uroporphyrinogen-III.