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Biliproteins are water soluble pigments which are also known as phycobilins. It includes phycoerythrin (red) and phycocyanin (blue). These pigments absorb sunlight at wavelength of blue and red. There are seven types of phycobilins. They are Phycoerythrin-r, -c, -x, -b and Phycocyanin r and -c and the final one is Allophycocyanin. Phycobilins are commonly found in the red and blue green algae. The blue pigment allophycocyanin is found only in the blue green algae. The light is not absorbed by chlorophyll are absorbed by phycocyanin and phycoerythrin. It is then transferred to the chlorophyll -a and is used for synthesis of food.

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