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Chemical structures and significance of photoprotective compounds: (A) asterina-330, (B) mycosporine-glycine, (C) palythine, (D) palythinol, (E) porphyra-334, (F) shinorine, (G) β-carotene, (H) astaxanthin, and (I) scytonemin obtained from different cyanobacteria and algae.
