Woodrow G C, Langman L, Young I G, Gibson F
J Bacteriol. 1978 Mar;133(3):1524-6. doi: 10.1128/jb.133.3.1524-1526.1978.
Isolation of six strains of Escherichia coli K-12 carrying mutations affecting the citrate-dependent iron uptake system is described. Genetic analysis of these mutants showed that the mutation affecting the citrate system are cluster together at about min 6 on the E. coli chromosome.