Studies in the cellular basis of morphogenesis of the sea urchin embryo: The formation of the blastula. We conjecture that overall utility for the community is maximized if we adopt a causal theory of reference [Kr80]. Control of the onset of transcription. The allocation of early blastomeres to the ectoderm and endoderm is variable in the sea urchin embryo. Significance of the polar lobe for the determination of dorsoventral polarity in Dentalium vulgare da Costa.
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