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ECB-ART-51867
Dev Growth Differ 1977 Jan 01;193:233-239. doi: 10.1111/j.1440-169X.1977.00233.x.
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FORMATION OF JOINED LARVAE IN THE STARFISH, ASTERINA PECTINIFERA.

Dan-Sohkawa M .


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A method for joining larvae in the starfish, Asterina pectinifera, is presented. Any number of embryos are stably united by simple contact of the cell clusters (descendents of individual denuded eggs) before reaching the early blastula stage (ca. 6 1/2 hr after insemination at 21°C). Embryos do not combine with each other after closing into hollow blastulae. This is considered to indicate the transformation of the cell cluster from a mere collection of cells to an individual, multicellular system. Biological meanings of the fertilization membrane are discussed.

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