Feskov, O., Feskova, I., Zhylkova, Y., Rudenko, V. and Blazhko, O. 2021. Change in the karyotype of the embryo as a cause of spontaneous abortion in the first trimester. The Journal of V.N.Karazin Kharkiv National University. Series «Biology». 37, (Dec. 2021), 43-50. DOI:https://doi.org/10.26565/2075-5457-2021-37-3.