SUMMARY: A genetic map of eight structural genes involved in arginine synthesis in strain 13 was obtained by transduction. Genes form a cluster linked to the gene , the gene is linked to a locus which controls resistance to 1 mg./ml. streptomycin, is linked to a pyrimidine marker, while the gene could not be co-transduced with other markers. The clustering and order of , the linkage of to and the non-linkage of and to other arginine genes are features shared by and differs from the other organisms in that is included in the cluster. This cluster is closely linked to and not to methionine markers. , which is the gene for the sixth step in the pathway, is linked to a pyrimidine marker while in this step is governed by two genes, one of which () is linked to


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