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Phycocyanin absorbs strongly at 620nm

Fluorescence can be described in two parts: absorption and emission. For something to fluoresce it first must absorb light. The light that we can see is just a narrow part of the entire electromagnetic (light) spectrum that ranges from radio and microwaves through infrared, visible, and ultraviolet light to x-rays and gamma rays. Light is classified into these groups by wavelengths that range in size from 100s of meters to a trillion times smaller.

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