Abstract
FROM the structure of the gastrula and the observation of the movement of the primary mesenchyme cells first towards the animal pole along the lateral bordering of the oral field and then back, finally surrounding the ventral half of the oral field, the hypothesis was derived that an unknown factor is spreading from the centre—the later mouth—of the oral field towards the margin of it1. This spreading is accompanied by the differentiation of the cells of the oral field, for example by a decrease of unspecific esterases from the centre towards the margin2. Where the oral field is in contact with the dorsal and ventral ectoderm the ciliary band is differentiating.
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References
Czihak, G., Fortschr. Zool., 14, 238 (1962).
Czihak, G., Roux' Arch. Ent.-mech. Tiere, 154, 29 (1962).
Wolpert, L., and Mercer, E. H., Exp. Cell Res., 30, 280 (1963).
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CZIHAK, G., MEYER, G. Differentiation of the Oral Field of the Sea Urchin Embryo. Nature 201, 315 (1964). https://doi.org/10.1038/201315a0
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DOI: https://doi.org/10.1038/201315a0
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