PT - JOURNAL ARTICLE AU - Mark Paul PaĊĦek TI - <em>Ostreococcus</em> tauri is cobalamin-independent AID - 10.1101/065771 DP - 2016 Jan 01 TA - bioRxiv PG - 065771 4099 - http://biorxiv.org/content/early/2016/07/26/065771.short 4100 - http://biorxiv.org/content/early/2016/07/26/065771.full AB - The marine microalga Ostreococcus is considered to depend on the methionine synthase METH and its methylated cobalamin cofactor for methionine synthesis. Here I describe minimal media lacking both cobalt and cobalamin yet suitable for clonal growth of Ostreococcus tauri. Because Ostreococcus lacks the methylcobalamin-independent methionine synthase METE, Ostreococcus growth without cobalamin is unexplained.