The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and oestrogen.

@article{Manning1998TheRO,
  title={The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and oestrogen.},
  author={John T. Manning and D. Scutt and Jacquelyn Wilson and David Iwan Lewis-Jones},
  journal={Human reproduction},
  year={1998},
  volume={13 11},
  pages={3000-4}
}
The differentiation of the urinogenital system and the appendicular skeleton in vertebrates is under the control of Hox genes. The common control of digit and gonad differentiation raises the possibility that patterns of digit formation may relate to spermatogenesis and hormonal concentrations. This work was concerned with the ratio between the length of the 2nd and 4th digit (2D:4D) in humans. We showed that (i) 2D:4D in right and left hands has a sexually dimorphic pattern; in males mean 2D… CONTINUE READING
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Segmental 2:4 digit ratio. Unilateral, bilateral and hand-type differences in men.

Homo : internationale Zeitschrift fur die vergleichende Forschung am Menschen • 2011
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