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Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. VEGETAL POLE Fig. 180.—An unseg- mented frog egg. ANIMAL HEMISPHERE Gastrulation in the Frog Embrj^o.
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Figure 1 from The early blastocyst is bilaterally symmetrical and its axis of symmetry is aligned with the animal-vegetal axis of the zygote in the mouse. | Semantic Scholar
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