Analysis of information sources in references of the Wikipedia article "Tvilling" in Danish language version.
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Although each twin will start off with the same DNA content, they may not be exactly 100% identical genetically because of post-zygotic changes in the DNA, and epigenetic effects that might influence overall gene expression.(citat fra ScienceDirects uddrag af kapitlet.)
{{cite journal}}: Eksplicit brug af et al. i: |author= (hjælp)Although each twin will start off with the same DNA content, they may not be exactly 100% identical genetically because of post-zygotic changes in the DNA, and epigenetic effects that might influence overall gene expression.(citat fra ScienceDirects uddrag af kapitlet.)