Fig. 8. Heuser,
Rock and Hertig, 1945.
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| Embryo 7801 - Stage 6 | Fig. 8. Heuser,
Rock and Hertig, 1945. |
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| The primitive streak apparently ends at this level, and grades into a mass of undifferentiated cells which extends caudally into the body stalk. Section 153. | |
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