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Jacobson GK, et al. Astaxanthin over-producing strains of Phaffia rhodozyma. US Patent 5,466,599 dated Nov 14 1995
Jacobsen GK, et al. Astaxanthin over-producing strains of Phaffia rhodozyma, methods for their cultivation, and their use in animal feeds. US Patent 5,922,560 dated Jul 13 1999