Cytoplasmic microtubules and the mechanism of avian gastrulation☆☆☆★
[摘要] Cellsoftheprimitivestreakinbothchickandpenguinembryosdemonstrateelongatebottleshapesaswellascuboidal-columnarshapes.Wesuggestthatachangeincellshapeisarequirementforinvagination.Thechangeinshapeofprimitivestreakcellsmaybeinitiatedbytheelaborationofcytoplasmicmicrotubules;thesemayactbytransportingcytoplasmfromapicaltobasalportionsofepiblastcells.Bundlesofmicrotubulesarefoundwithinandarrangedparalleltoattenuatednecksofinvaginatingepiblastcells.Themodeofactionofthesemicrotubulesisnotknown,butwithinelongateneckregionsmicrotubulesarelongandstraightratherthancoiled.Duetocytoplasmictranslocationplustheconcertedactionoflobopodialandfilopodialcytoplasmicextensions,andspecializedcellcontacts,primitivestreakcellsaredisplacedbeneaththeepiblast'sfreesurfaceintothemesoblast.
[发布日期] [发布机构]
[效力级别] [学科分类] 生物科学（综合）
[关键词] [时效性]
