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Uptake of 59Fe in immortalized rat yolk sac cells incubated with 59Fe-Tf (1500 cpm/well). Inhibition of uptake by human Tf (1 mg/ml), anti-cubilin polyclonal antibody (200 μg/ml), rabbit IgG (200 μg/ml), and RAP (1 μM). The values are the mean ± 1 standard deviation of triplicate measurements.
