| Embryo 8155 - Stage 5a 2 | Fig. 6. O'Rahilly and Müller, 1987. |
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| Section approximately through the middle of embryo. The amniotic cavity and the bilaminar embryonic disc can be seen, although an amnion as such is not yet distinct. The thick, solid trophoblast at the embryonic pole is mainly syncytiotrophoblast. The endometrial stroma is edematous. | ||||
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