Fig. 17. Heuser,
Rock and Hertig, 1945.
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| Embryo 7802 - Stage 7 | Fig. 17. Heuser,
Rock and Hertig, 1945. |
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| An enlarged part of the preceding section reveals branched villi on the entire external surface of the chorion. The cytotrophoblast at the tips of the villi is in process of forming a continuous zone (Cyto.) around the ovum. Section 428. | |
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