| 1. | Each macromere has the potential of becoming the D macromere.
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| 2. | Each macromere has the potential of becoming the D macromere.
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| 3. | This larger cell is specified as the D macromere.
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| 4. | :Specification of the D macromere and is an important aspect of spiralian development.
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| 5. | This contact is required to distinguish one macromere as the official D quadrant blastomere.
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| 6. | The polar lobe contains vegetal cytoplasm, which becomes inherited by the future D macromere.
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| 7. | The D macromere facilitates cell divisions that differ from those produced by the other three macromeres.
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| 8. | At the 4-cell stage of equal cleavage, the D macromere has not been specified yet.
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| 9. | All teloblasts are specified from the D quadrant macromere after the second round of divisions post-fertilization.
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| 10. | Unlike equally cleaving spiralians, the D macromere is specified at the four-cell stage during unequal cleavage.
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