TABLE 4.

Mutants with mutations related to glnA tested for loss of Mg²⁺-dependent biomass increase^a

Category	Genes
Responded to magnesiumb	ybaS, yneH, asnB, hisH, trpE, crr, ptsG
No responsec	guaA, purF, purL, carB, carA, ptsH, ptsI

^aMutants were grown in buffered tryptone broth supplemented with 0.4% glucose alone or with 1 mM MgSO₄ for 24 h. Biomass was determined by OD₆₀₀ measurements.

^bBy 9 h of growth, mutants that had increased biomass with magnesium supplementation were considered responders.

^cMutants in bold did not respond even after 24 h; other mutants responded between 9 and 24 h.