Patternformationisoneoftheessentialprinciplesofdevelopment(I),embryogenesisistheprocessbywhichtheembryowithawell-,differentiation,movement,,thequestionofhowthismorphogenesishappensisreallyaboutpatternformation(模式建成).(身体图式)-definingthemainbodyaxesoftheembryosothatthehead(anterior)andtail(posterior)ends,andtheback(dorsal)andunderside(ventral)-posterioraxis,whichrunsfromtheheadtothetail,andthedorso-ventralaxis,,theembryoispatternedalongboththeantero-posterior,anddorso-,prisedofthebodyaxesspecification/formation,,(II)-posterioranddorso-(Xenopus)-,theembryoispatternedalongthetwoaxes:thatistodividetheembryointodistinctregionsalongbothaxesTheDrosophilafemalereproductivesystemEggdevelopmentinDrosophila
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