Enzymatic activity and structural peculiarities of human erythrocyte membranes obtained by different methods, are analyzed in the paper. Our studies have demonstrated different enzymatic activity of the preparations of right side- and inside-out vesicles of human erythrocyte membranes. Fluorescence probes of pyrene and ANS have shown that these membrane preparations have different physical characteristics of lipid and conformational properties of membrane proteins and differ in the composition of their protein-lipid ensembles.
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