FIG. 4.
Sensitivity to Na+ ions of trk mutants. Cells (wild type, ●; trk1, ○; trk2, ▾; trk1 trk2, ▿) were grown on YES medium supplemented with different concentrations of NaCl. Sodium sensitivity was determined as described in Materials and Methods. Data are means ± standard errors of the means from five to seven experiments.