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Comparison of OPN protein levels in the rat endometrium at the time of embryo implantation. All values were presented as mean±SEM. Error bars represent standard error of mean. p<0.05 was considered statistically significant. Data analysis reveals that significant differences were observed between all four groups. In western blot image, D=diabetic control, C=control group, D+P=diabetic rats treated with pioglitazone and D+M=diabetic rats treated with metformin
