Abstract
SYNOPSIS. Arginine in Trypanosoma cruzi is taken up by a mediated transport system; a large non‐saturable component is also involved. Arginine transport specificity in T. cruzi is unusual since lysine and histidine do not inhibit its uptake. Glycine and valine are partially competitive inhibitors and homoarginine, alanine and methionine are completely competitive. At least one arginine transport site is so specific that homoarginine will not react with it. Apparently the diamino acid transport systems of T. cruzi have undergone major evolutionary modifications.
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