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Maximal TGF responses (change in PSF in LH perfusion of 0 and 40 nl/min) during perfusion of late proximal tubules with ATF + Veh, ATF + Pxb (10−5 M; open bars), and ATF + neuronal nitric oxide synthase inhibitor Nω-propyl l-arginine (LNPA; 10−6 M) and ATF + LNPA + Pxb (closed bars).
