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- 23:18, 6 August 2017 Z8600021 talk contribs uploaded File:LewisHarrison1966 fig05.jpg (Fig. 5. Appearance of the embryo with its yolk-sac duct, and the implantation site. The yolk-sac contains a collection of erythrocytes in its lumen. The distal portion of the yolksac duct is being constricted off from the remainder. Chorionic villi in...)