Figure 6.

Percent uptake of 50 uM [³H]-Thr in the presence of 140 mM NaCl and increasing concentrations of (A) Ser or (B) 3-HNV (n = 6 for each point; 3 determinations obtained in each of 2 independent experiments). Thr uptake was also measured in the presence of 20 mM non-radiolabeled Thr. A 2-sample t-test indicated that [³H]-Thr uptake in 20 mM Ser was not significantly different from [³H]-Thr uptake in 20 mM non-radiolabeled Thr (p > 0.05), whereas [³H]- Thr uptake in 20 mM 3-HNV was significantly higher than [³H]- Thr uptake in 20 mM non-radiolabeled Thr (p < 0.05). A one-way ANOVA also indicated that 50 uM [³H]-Thr uptake significantly decreased with increasing concentration of Ser or 3-HNV (p < 0.05).