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Biopterin transport in L. donovani cells. Transport of [3H] biopterin was measured in L. donovani wild-type cells (black box), a BT1 null mutant (BT1 ko) (hatched box), and a BT1 null mutant retransfected with a plasmid expressing BT1 (white box). Results are averages of triplicate values, for which the uptake at 4°C was subtracted from the values at 25°C.
