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Boxplot diagrams showing the average methylation percentage of H19, SNRPR, and PEG3 in six groups (AOA-C, AOA-B, AOA-P, NOA-C, NOA-B, and NOA-P). Comparison results between groups without activation and between groups with activation were separately conducted. Boxplots with the same superscripts are significantly different (P value <0.05).
