Fig. 24. Heuser,
Rock and Hertig, 1945.
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| Embryo 7802 - Stage 7 | Fig. 24. Heuser,
Rock and Hertig, 1945. |
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| An early stage of the primitive node (Prim. Node) of Hensen is indicated by a rearrangement of cells in the middle part of the germ disk. The node has not yet produced a noticeable localized elevation of the germ disk. Section 420. | |
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