Phenotype of the null mutants of cmdABCDEF on MS plates. (A) Growth of single and multiple null mutants of the cmdABCDEF genes on MS for three days. The parental strain is M145. (B) A time course of culturing M145 and the null mutants. Strains were inoculated as ~1 cm2 patches on MS medium. Time points of observation are shown on the right.