| http://www.w3.org/ns/prov#value | - However, monozygotic twin siblings frequently present many phenotypic differences, such as their susceptibility to disease [italics added] ??? Recent studies suggest that phenotypic discordance between monozygotic twins is at least to some extent due to epigenetic [changes in gene expression caused by mechanisms other than changes in the underlying DNA sequence] factors that change over the lifeti
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