Illustration from Scientific Research

Genomic organization of vitamin B 12 biosynthetic genes. The pink arrows represent the genes for Uroporphyrinogen-III synthesis; the purple ones represent genes involved in the corrin ring synthesis; the orange one represents cobalt chelatase gene for insertion of cobalt ions into the corrin ring; the green ones represent genes for the attachment of the aminopropanol arm and assembly of the nucleotide loop in vitamin B 12 ; the blue ones represent the genes encoding ABC transport systems for vitamin B 12

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