FIG. 1.

Linear purine transport in axenic amastigotes of Leishmania mexicana. A. Time course of 1 μM [³H]adenosine uptake by L. mexicana amastigotes in the presence (□) or absence (▪) of 1 mM unlabeled adenosine. B. Uptake of 1 μM [³H]hypoxanthine was linear over 120 s (r² = 0.97), as calculated by linear regression, in the presence (□) or the absence (▪) of 1 mM unlabeled hypoxanthine. C. Uptake of 1 μM [³H]adenine was linear over 120 s (r² = 0.94), as calculated by linear regression, in the presence (□) or the absence (▪) of 1 mM unlabeled adenine.