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The Spemann Organizer ofXenopusIs Patterned along Its Anteroposterior Axis at the Earliest Gastrula Stage

BiologyMorphological EvidencePattern FormationUnicellular OrganismDevelopmental BiologyPhylogeneticsProtistMedicineNatural SciencesEvolutionary BiologyMorphogenesisEarliest Gastrula StageBiological Life CycleAnteroposterior AxisSpemann Organizer OfxenopusisEvolutionary Developmental Biology