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monozygotic female twins

Acta geneticae medicae et gemellologiae: twin research (1)

International Soc for Twin Studies (1)

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Latent Menstrual Cycle in Pre-Menarcheal Monozygotic Twins
I. Nakamura, C. Harada, T. Miura
Journal:

Acta geneticae medicae et gemellologiae: twin research / Volume 42 / Issue 3-4 / October 1993

Published online by Cambridge University Press:

01 August 2014, pp. 295-297

Print publication:

October 1993
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The distribution of menarcheal interval-length between cotwins in 67 pairs of female identical twins in Tokyo was found to cluster at fairly constant intervals. When delayed in one twin, the menarche occurred in the second twin at intervals of approximately 28 days after that of the earlier twin. This finding suggests the existence of a latent lunar or menstrual cycle in pre-menarcheal girls, evidence for which was detected by recording the menarcheal intervals between MZ cotwins in days.