Sandmann, G (2021). "Diversity and Evolution of Carotenoid Biosynthesis from Prokaryotes to Plants.". Carotenoids: Biosynthetic and Biofunctional Approaches. Advances in experimental medicine and biology. Vol. 1261. pp. 79–94. doi:10.1007/978-981-15-7360-6_7. PMID33783732.
For concrete examples of the diversity of gene organization, compare the clusters presented in [6] figure 1 (6 genomes), PMID37887056 figure 1 (4 genomes), PMID22963379 figure 1 (10 genomes), and PMID32155882 figure 3 (11 genomes).
Carotenoid biosynthetic pathway: molecular phylogenies and evolutionary behavior of crt genes in eubacteria. Phadwal K, Gene, 17 January 2005, volume 345, issue 1, pages 35-43, PMID15716108
Molecular phylogenies and evolution of crt genes in algae. Chen Q, Jiang JG and Wang F, Crit Rev Biotechnol., Apr-Jun 2007;, volume 27, issue 2, pages 77-91, PMID17578704
Activation and analysis of cryptic crt genes for carotenoid biosynthesis from Streptomyces griseus. Schumann G1, Nürnberger H, Sandmann G and Krügel H, Mol Gen Genet., 28 October 1996, volume 252, issue 6, pages 658-666, PMID8917308
Sandmann, G (2021). "Diversity and Evolution of Carotenoid Biosynthesis from Prokaryotes to Plants.". Carotenoids: Biosynthetic and Biofunctional Approaches. Advances in experimental medicine and biology. Vol. 1261. pp. 79–94. doi:10.1007/978-981-15-7360-6_7. PMID33783732.