Figure 4.
Activation of 32PO4 influx by monovalent cations in erythrocytes and K562 cells. Monovalent cation activation of 32PO4 influx in the presence of 1.0 mM external phosphate, pH 7.4, 37ºC, and fluxes were carried out as described with each indicated cation present at 143 mM using the chloride salt. The standard errors of six determinations in one of four similar experiments.