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- 11:17, 2 September 2011 S8600021 talk contribs uploaded File:Fetal facial expression 01.jpg (==Fetal Facial Expression== Illustration of developmental progression in number of action units (AUs) over gestational age. (a) One AU at 24 weeks. (b) Two AUs at 27.5 weeks. (c) and (d) two different combinations of 4 AUs at 32 weeks. Original file n)