Generation of electronically excited species is a distinct possibility in biological systems; the most likely ones at present appear to be flavins, metalloporphyrins, oxygen and certain conjugated carbonyl compounds. Thyroxine should be very active in certain cases of electronic energy transfer.
No takes yet. Share an insight, caveat, or question.
Giuseppe Cilento (1965) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:
More from Photochemistry and Photobiology