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Brennan. Ollie rose and spread both hands, the left missing most of its fourthdigit.
2
The fourthdigit exceeds the second in size, and the second is much the shortest of all.
3
They measured the 2D-4D ratio -the relative length of the second and fourthdigit, an indicator to exposure to prenatal testosterone.
4
The relative length of the second and fourthdigits (2D:4D) is thought to be negatively related to prenatal testosterone and positively related to prenatal estrogen.