FIG. 3.
Uptake of L-[U-14C]glutamic acid by S. mutans UA159 in the presence of a 10× excess of competing amino acids. Maximal uptake was measured after 2 min of incubation with labeled glutamic acid and unlabeled competing amino acids and then normalized to the maximal uptake in the absence of competing amino acids. Uptake was almost completely inhibited by an excess of glutamate, partially inhibited by an excess of aspartate and cysteine, and somewhat inhibited by an excess of glutamine. ***, P < 0.05 (n = 7).