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Phycocyanin (Spirulina blue) is a kind of sky blue powder extracted from spirulina. It is a kind of protein, also an excellent natural edible pigment, as well as a good healthy food. Phycocyanin is one of the rare pigment proteins in nature, it is not only colorful, but also a kind of nutritious protein, the amino acid composition is complete, with high content of the necessary amino acids.