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It was proved that singulair does not cause macroscopical and histological alterations on the animals, but it is not known its influence on the molecular level. The purpose of our work is to explore teratogenic effects of singulair on the animals by using our non-standard method (which is preciser than standard method, because it showes not only macroscopical, but also and molecular alterations in the damage tissue), hoping, that it would be the help for the pregnant women to decide can they take this drug or not. We injected singulair (25 mg/kg of rat) to one group of pregnant rats in rareripe period (from the first to the eight day) of embryogenesis. Another group of pregnant rats got injections of teratogenic substance ochratoxin A (25 pg/kg of rat) in the same period of embryogenesis. The third group got injections of physiological solution. There were taken 10 rats to everyone group. In the end of rareripe period we took a blood sample from each rat of the rats and wrote a spectrum of everyone sample by using spectrophotometer. We got, that spectra of solutions from the first and the third group were very similar (there were no statistical difference) and spectra of solutions from the second group were very similar (there were no statistical difference), but statistical difference was between the first and the third group together and the second group in the zone of 200-350 nm. At the twentieth day of pregnancy we made Caesarean section to all of the rats, compared embryos interpendent and did not find any defects in anyone of them through all the first and the third group, but everyone embryo from the second group had a lot of defects.
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