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Late in the second week of human gestation, the embryo has two cell layers, an epiblast and a hypoblast.

(The mouse embryo in the micrograph on the top has a more curved form at this stage than the human, as shown in the diagram on the bottom)

                     Species: Mouse 
                     Day Gestation: 7 
             Approx. Human Age: 16 Days 
                                   View: Section 
              Germ Layers & Gastrulation
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