Abstract
Nitrobenzylthioinosine, a potent nucleoside-transport inhibitor, binds specifically to functional nucleoside transport sites. Irradiation of freeze-dried human erythrocyte membranes with high-energy electrons was used to estimate the apparent MW of the nitrobenzylthioinosine-binding complex in situ. The nitrobenzylthioinosine-binding complex had an apparent MW of 122,000.