PurifiedhumanLDL(d=1.019-1.063g/mL)isoxidizedwithcopper(II)sulfateandlabeledwithDiI(1,1"-dioctadecyl-3,3,3",3"-tetramethylindocarbocyanineperchlorate).Thepurifiedprobeisultrafilteredthroughamembraneandpackagedasepticallyundernitrogen.Theproductisprovidedinasolutionwith154mMNaCland0.34mMEDTA,atpH7.2.