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[Changes in bone structure according to the results of investigations on biosatellites of the "BION" series].

Noninvasive technologies of bone investigations measure largely the main skeletal sites and are not quite suitable to have a look at the bone internal organization in situ. However, there are data obtained noninvasively in experiments on board the space biosatellites. The review is dedicated to analysis and comparison of the evidence for the bone organic and mineral matrix restructuring due to microgravity. These changes have presumably evolved in the course of the system reaction of bone tissue and the whole skeleton.