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The comparative analysis of the blood erythrocyte lipid composition of the laboratory mice (males and females) after exposure to the chronic radiation action at the dose of 8 cGy during the early stages of the ontogeny was performed within the early and remote periods after irradiation. This action is shown to cause the marked effect both on the quantitative changes in the lipid composition and the structural state of the blood erythrocyte lipid component as follows from the numerous disturbances of the correlation interrelations between parameters of the lipid composition which are due to the structural state of the erythrocyte membrane. The most substantial changes in the blood erythrocyte lipid composition were detected for males within the remote period after the exposure, which provides evidence in favor of the disorder in the hemopoiesis process. The data obtained allow us to suggest that the erythrocyte membrane viscosity under the chronic low intensity irradiation is supported by the balance maintenance between the relative content of the phospholipid lysoforms and the molar ratio of the [sterols]/[phospholipids].