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Age-adjusted leukocyte telomere length (LTL) and LTL attrition in same-sex (SS) twins (monozygotic, MZ; and dizygotic, DZ; pooled), and in opposite-sex (OS) twins. Left panel displays LTLs, bars show least square means from the model in Table 2A; right panel displays LTL attrition rate. *P < 0.05; **P < 0.01; ***P < 0.001.
