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Right- and Left-Handedness


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: 到8週,75%的胚胎 展示右手向先。 餘下的胚胎中 左手向先和 沒有偏愛者 各佔一半。 這是右手或左手向先 舉止的最早跡象。

All ages referenced to fertilization, not last menstrual period.
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