en 29849990 <p>Background: Exact mechanisms of fetal harm following vitrification are still unknown. This study was conducted to evaluate the cryopreservation impact on the expression of Epidermal <em>Growth Factor Receptor</em> (<em>EGFR</em>) gene in mouse 2-cell and blastocysts.<br /> Methods: To stimulate ovulation in mice, hCG was injected, followed by collecting 2-cells and blastocysts after 44-46 and 88-89 <em>hr</em>, respectively. These embryos were divided into two case and control groups. The fresh case group was cryopreserved using cryotop and warmed after 4 mounts. Normal 2-cells were selected based on their morphology and their RNA was extracted. Quantitative expression of <em>EGFR</em> gene in both groups was investigated by applying real time-PCR.<br /> Results: The statistical real-time (RT)-PCR analyses performed using SPSS revealed that the expression level of EGFR gene was diminished in the case group compared to the control group.&nbsp;<br /> Conclusion: The current study indicated the negative effect of cryopreservation on expression amount of <em>EGFR</em> gene in 2-cell and blastocyst mouse embryos.</p> Blastocyst, Cryopreservation, Embryo, Gene expression, Vitrification 120 122 https://www.ajmb.org/En/Article.aspx?id=334 https://www.ajmb.org/PDF/En/FullText/334.pdf RouhollahGazorDepartment of Anatomy and Cell Biology, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran1337MozhganEskandariDepartment of Anatomy, Ardabil University of Medical Sciences, Ardabil, Iran1338AlirezaSharafshahCellular and Molecular Research Center, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran1339Mohammad HadiBahadoriDepartment of Anatomy and Cell Biology, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran1340Mohammad GhasemGolmohammadiDepartment of Anatomy, Ardabil University of Medical Sciences, Rasht, Iran1341ParvanehKeshavarzCellular and Molecular Research Center, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran1342