Selective L-arginine transporter that is essential for parasite survival and virulence (PubMed:28205520, PubMed:30742695). Does not require other inorganic ions such as sodium, chloride, potassium or calcium (PubMed:28205520). L-arginine(in) = L-arginine(out) Optimum pH is 5-8. Impaired parasite growth under conditions of restricted arginine availability (PubMed:28205520). Does not cause toxoplasmosis in mice (PubMed:28205520). Belongs to the SLC43A transporter (TC 2.A.1.44) family.