Index of Electron Micrographs of Stage 4 Human Embryos In Vitro (3 of 3)  | 
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Fig. 13. Long slender projection of a cytotrophoblast cell. 
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    Fig. 14. Mural trophoblast 
 
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    Fig. 15. Details of the contact zone between the endometrial cells and a cytotrophoblast cell. 
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