Natural Distribution Of Pigments

Chlorophylls and carotenoids are the most abundant pigments in nature. They are involved in fundamental processes, and life on Earth depends on them. Plants, photosynthetic bacteria, and protozoa (plankton) are the main sources of the organic materials that are required for the development of other living organisms such as vertebrate and invertebrate animals. Chlorophyll is not found in animals but caro-tenoids accumulate in some organs (e.g., eyes) and tissues (e.g., skin of fish, bird plumage). In general, animal carotenoids are obtained from the common diet. Other pigments are also found in animals (Table 3.2); some have important functions (e.g.,

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