FIELD: medicine.
SUBSTANCE: for trophoblast cells biopsy in human embryos preimplantation genetic screening programs, blastocysts pellucid zone is completely removed in the presence of multiple cells that do not participate in compaction. Trophoblast cells are freed, biopsy is performed not including the cells that are not involved in compaction into the material transferred to genetic diagnosis.
EFFECT: method allows to obtain biopsy material of good quality due to the complete removal of the pellucid zone.
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