Is there a biochemical that can change color AND emit light?

I have a group of settlers that live on top of an animal, and I want his skin to be their mode of communication. In the morning, information is transmitted through chromataphores in the skin changing color (don't ask how the info is interpreted, I'm still working on it), and at night use channels and nodes of bio-luminescent light from luciferin-superoxide reactions.

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Is there a biochemical that can change color AND emit light?

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