My sister and I are absolute complete opposite. The states with the highest rates of twins are Connecticut, Massachusetts, and New Jersey, and the state with the lowest rate is New Mexico. Like any sibling relationship, it does have its advantages, and disadvantages, but being a twin provides you will the valuable advantage that you will nearly always have a friend for life! The mean number of nevi was 35, with a median of 22 range, Accordingly, both shared and unique environmental factors had a greater effect on the variance for nevus counts on sun-exposed sites. Monozygotic twins with congenital adrenal hyperplasia:
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Where is the hidden heritability? Diabetes, obesity, and autoimmune thyroid disease are the most common endocrine disorders in general practice. Example From the ProMort Study. Almost no one can tell them apart except very close family and friends. The gene versions that increase the chance of hyperovulation can be passed down from parent to child. However, the validity of the twin method depends on the equal environment assumption--that monozygotic MZ and dizygotic DZ twins are equally correlated in their exposure to environmental factors of aetiological importance for the disorder under study.
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Twin study - Wikipedia

Yes there are plenty of those, LOL! A population-based study of chronic autoimmune hypothyroidism in Danish twins. T-cell receptor repertoire analysis in monozygotic twins concordant and discordant for type 1 diabetes. Large epidemiologic studies, especially those looking at migrants to sunny climates, have clearly established that sun exposure and ethnic background are significant risk factors 2. The same is not true for fraternal twins.
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International Society of Twin Studies. The doctor said they would need a DNA test to know for sure. That is a very interesting question! My twin sister and I just got tested at ARCpoint Labs and after 56 years we found out we are identical! A population-based twin case-control study. Mayo Clin Proc ;
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Adult dizygotic twins

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