%0 Journal Article %T Drug delivery via active transport at the blood-brain barrier: affinity of a prodrug of phosphonoformate for the large amino acid transporter %A Walker, Ian %A Nicholls, Dave %A Irwin, William J. %A Freeman, Sally %A , %J International Journal of Pharmaceutics %V 104 %N 2 %P 157-167 %@ 0378-5173 %D 1994-04-01 %I Elsevier BV %~ DeepDyve