Low index-to-ring finger length ratio in sporadic ALS supports prenatally defined motor neuronal vulnerability
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    A Simple Non-Invasive Method of Testing Whether High Intrauterine Testosterone Concentrations Are a Cause of Amyotrophic Lateral Sclerosis : A Response to Papers of Vivekananda et al.

    Vivekananda et al(1)report that when controlled for sex, cases of sporadic amyotrophic lateral sclerosis (ALS) have a lower mean finger length ratio R [where R = (2D / 4D) and 2D and 4D are the lengths of the 2nd and 4th digits respectively] than healthy controls. These authors interpret their finding as indicating prenatal involvement of high concentrations of intrauterine testosterone, T. However, their interpretation...

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