Phycocyanin

**Definition:** The metal-free blue phycobilin pigment in a conjugated chromoprotein of blue-green algae. It functions as light-absorbing substance together with chlorophylls.

**Tree numbers:** - D05.500.562.488.490.500.500.755 - D08.811.600.710.490.500.500.755 - D12.776.765.650 - D23.767.690