HT1080 cellular uptake of <sup>57</sup>Co-Cbl in the presence of various concentrations of HS or FCS.

<p>HT1080 cells were incubated at 37°C with <sup>57</sup>Co-Cbl in DMEM containing either HS or the given HS / FCS mixture. <b><i>A</i>—<i>D</i></b>, In all experiments, the cells were harvested for <sup>57</sup>Co analysis after 48 h. Data are mean values <u>+</u> SE (n = 3).</p>