Table 2.

Concentration of potassium and sodium in incubation solutions used in experiments

Incubation solution	Concentration of K+ (mmol/L)	Concentration of Na+ (mmol/L)
Dulbecco’s Modified Eagle Medium (DMEM)	5.3	155.0
RPMI-1640 medium	5.3	138.5
Phosphate buffer saline (PBS)	4.2	153.0
Phosphate buffer saline (PBS) without K+	0	157.0

Concentration of potassium and sodium in incubation solutions used in experiments. To modulate ²⁰¹Tl uptake in cells, 0 mmol/L K⁺ solutions were supplemented with KCl at a range of concentrations up to 25 mmol/L