Fig. 25. Heuser,
Rock and Hertig, 1945.
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| Embryo 7802 - Stage 7 | Fig. 25. Heuser,
Rock and Hertig, 1945. |
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| The transition of the node to primitive streak (Prim. Str.) is presumably occuring in the middorsal region of the germ disk. The beginning of the streak is represented by the cells emerging from the under surface of the disk. Section 415. | |
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