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Reaggregation of sea urchin blastula cells: I. Intrinsic differences in the blastula cells☆☆☆
[摘要] Thereaggregationprocesswasstudiedindissociatedblastulacellsfromseaurchinembryostocharacterizethedegreeofdifferentiationamongthem.Duringthereaggregationprocessatleastfourdifferentcelltypesappear:(a)cellsthatremainround,donotreaggregate,andcandifferentiateintopigmentcells;(b)epithelialcellsthatspreadonthesubstratumandjointogethertoformepithelialsheets,whichthendevelopciliaandrounduptoformblastulalikestructures;(c)spindle-shapedcellsthatsendoutprotoplasmicextensionsoverlongdistancestomakecontactwithothercells;(d)singlepolyfilamentouscells,theircytoplasmextendingintofilamentsandformingabranchednetwork.Thepolyfilamentouscellsalsoformsyncytiaandcanshowregionaldifferentiationintopigment.Partialsuccessinseparatingtheabovetypesofcellshasshownthatsomeofthemdifferintrinsically.Thedifferencesarereflectedinmorphologicaldifferentiationindifferentialresponsetocalcium,andinamountofhyalinproduced.
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[效力级别]  [学科分类] 生物科学(综合)
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