Identical Twins Reveal How Environments Change Gene Expression

Identical Twins Reveal How Environments Change Gene Expression

Studying twins has long offered insight into the interplay of nature and nurture. Epigenetics is the next frontier. Identical twins Monica and Erika Hoffman stand barefoot, side-by-side near a sign that reads “Twin Studies Center” at California State University at Fullerton. Their glasses removed, both have auburn eyes, softly jutted chins, light freckles, and perky noses. Both wear black shirts and small sparkly earrings (Erika’s are flowers, Monica’s, bows). The sisters turned 39 the day before this lab visit. “You are the 101st twin pair we’ve had in this study,” Nancy Segal, a shrewd, spirited professor in a sequined black...

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