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Comparison of bone mineral density and fatty acid (FA) blood content in nine subjects during 370-day head-down-tilt bed rest (BR) revealed correlation of the loss of femoral neck density (FND) with parameters of lipid metabolism. On day 46 of the BR, the absolute lipid content of erythrocyte membranes and blood serum were considerably decreased (by a factor of 1.5–2) compared with the baseline data...