Lineweaver-Burk plots of 2,4D-Lys uptake. A, Data
from Figure 5A (●); B, data from Figure 5B after subtracting the
CCCP-insensitive component; (▪), active component. Using
Eadie-Hofstee plots, the points corresponding to the highest
concentrations (1.5, 2.0, and 2.5 mm) parallel the vertical
axis.