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Consequently,…the…cell…fates…inferred…from…the…pattern…of…labeled…cells…at…the…early…larval…stage…might…not…have…been…entirely…accurate….Another…impediment…to…cell…lineage…studies…is…that…once…the…fertilization…envelope…is…removed,…the…polar…bodies…are…often…lost,…making…it…is…difficult…to…distinguish…animal…from…vegetal…blastomeres,…since…they…are…nearly…the…same…size…(Tung…et…al….Mouth/anus….In….protostome….development,….the….first….opening….in….development,….the….blastopore,….becomes….the….animal's….mouth…..Following….the….EMT,….the….cells….ingress….through….the….primitive….streak….and….spread….out….to….form….a….new….layer….of….cells….or….join….existing….layers…..422….^….a….b….McGeady,….2004:….p…..Conklin….(1932)….thought….they….were….ventralposterior….and….constituted….the….mesoderm…..

The…developmental…potencies…of…the…blastomere…layers…in…Amphioxus…egg…at…the…32-cell…stage….Axes…depicted…or…clearly…implied…in…the…original…figures…are…shown,…respectively,…as…solid…or…dashed…lines…[the…axis…shown…by…the…dotted…line…in…(Q)…is…discussed…in…the…text]….2007)….CrossRefMedlineWeb…of…ScienceGoogle…Scholar……Philippe…H,…Lartillot…N,…Brinkmann…H…….Cullen,..K.E…ISBN978-90-5702-419-1…(1958,…1960),…which…involved…isolation…of…blastomeres…as…well…as…labeling…them…with…Nile…blue…sulphate,…together…with…more…recent…studies…on…cell…movements…(Zhang…et…al….MedlineWeb…of…ScienceGoogle…Scholar……Delsuc…F,…Brinkmann…H,…Chourrout…D,…Philippe…H…….

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