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- 16:12, 2 August 2011 S8600021 talk contribs uploaded File:Human embryo day 5 label.gif (==Human Conceptus (day 5)== * By day 5 the blastocyst has a large blastocoel (fluid-filled space) with a single layer of thin (squamous) cells forming the trophectoderm. * The inner cell mass can be seen to the left of the blastocoel. * The blastocyst )