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A closer view shows the pericardial cavity, cardiac splanchnic mesoderm, and endothelium as well as an extracellular matrix-filled space between the latter two.

                     Species: Mouse 
                     Day Gestation: 8 
             Approx. Human Age: 19 days 
                                   View: Sagittal Cut
              Week 3 Development
                                   6b of 42