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Figure Caption
Fig. 8
Development of compact walls.
The development of the compact walls (Nppa and Gja5 negative) of mammals and birds leaves the trabeculated myocardium (Nppa and Gja5 positive) as a thin inner lining of the ventricular lumina in the fully formed hearts. Nppa is not expressed birds [36]. Scalebars, 100 μm. ivs, interventricular septum; lv, left ventricle.
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