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In mediating the entry of adenosine into mouse erythrocytes and mouse leukaemia L1210 cells, nucleoside transport systems were stereoselective, showing a marked preference for the D-enantiomer of adenosine (D-Ado). Inward zero-trans fluxes of the mirror-image isomer, L-adenosine (L-Ado), in those cells were slow relative to those of D-Ado. Contributing to L-Ado fluxes in both cell types were (i) a transporter-mediated process of high nitrobenzylthioinosine-sensitivity and (ii) simple diffusion.

Enantiomeric selectivity of adenosine transport systems in mouse erythrocytes and L1210 cells