The study of serum samples, obtained from 15 cosmonauts before and after space flights, with the use of the indirect fluorescent method showed that in 7 cosmonauts antibodies to different elements of the human heart muscle appeared after flights. Strong and very strong luminescence of the elements of heart muscle tissue was detected in the cosmonauts after the third space flight. When studying the sera on sections of bovine heart muscle tissue, the reactions of the sera taken before and after flights were found to have no essential differences.
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