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The antibody titer of the blood serum in the experimental animals treated with galarmin d-15 derivative of proline-rich polypeptide combined with inactivated streptococci has been evaluated according to the serological (precipitation) reaction. The investigated blood sera have been diluted in the physiological solution with the ratio of 1:5-1:20. It is worth mentioning that as a result of interaction with the
antigen, blood sera, treated with galarmin derivative and inactivated streptococci, have generated precipitate in case of 1:5-1:20 dilution ratio, while in the control variant it has been marked in case of 1:5-1:10 dilution ratio. As a result of numerous experiments it has been found out that the galarmin derivatives are modulators for the activation of humoral and cellular immunities.