Robuta

https://www.ncbi.nlm.nih.gov/Structure/pdb/8QX5 8QX5: Helical Carotenoid Protein 4 (HCP4) from Anabaena with bound Canthaxanthin Orange carotenoid-binding domain-containing proteinbeta,beta-carotene-4,4'-dione helical carotenoid protein