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a, Mean fold change in ERV (LTR elements annotated in UCSC RepeatMasker) expression in H3.3-knockout ES cells (two cell lines) over wild-type ES cells (one cell line). b, Fold change in ERV expression comparing two H3.3-knockout ES cell lines. ERVs belonging to the IAP family are marked in red. Only ERV groups with more than 100 family members were considered for analysis.
