Table 1.

Effects of inhibitors and competitors on phosphate uptake

Substance*	Relative uptake of phosphate, %
	pMi12	p35SPHT1
None	100	100
2,4-DNP, 100 μM	0	17
CCCP, 10 μM	15	12
Diethylstilbestrol, 100 μM	24	18
Phosphate, 100 μM	39	39
Phosphate, 2 mM	10	9
Arsenate, 100 μM	63	61
Arsenate, 2 mM	21	20

^*In the assay medium, the phosphate concentration was 100 μM for the phosphate competition experiments, in which cold phosphate was added to 100 μM or 2 mM. 2,4-DNP; 2,4-dinitrophenol, CCCP; carbonyl cyanide m-chlorophenylhydrazone.