Pattern formation during early amphibian development: Embryogenesis in inverted anuran and urodele eggs☆
[摘要] EarlyembryogenesiswasmonitoredinXenopus,Rana(anurans),andAmbystoma(urodele)eggswhichwereinvertedatvarioustimesbetweenfertilizationandfirstcleavage.Thepatternofcleavagefurrowformation,siteofinvolution,andextentoforganogenesiswereobserved.Inseveralinstances,patternformationwasdramaticallyaltered.Thesmall/largeblastomerepatternwas,forexample,reversedinsomeinvertedembryos.Developmentalarrestatearlyorganogenesisusuallyfollowedpatternreversal.Byemployingaseriesoftissuetransplantations,itwaspossibletoestablishthattheactivityoftheprimaryembryonicorganizerofinvertedembryoswasdiminisheddrastically.Thedevelopmentalcompetenceoftheprospectiveectodermofinvertedembryoswas,however,reversed.Incompleteorganogenesisininvertedembryosisthereforeprobablyduetoeitherabnormalmesodermformationordefectivetissueinteractions.
[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]
