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This is a paid asset, but now you can download Heart Animated Realistic Free.
Detail this asset from Unity Store: Original Link
Heart Animated Realistic v1.0
Realistic Heart with two polygons quality mesh, with detailed anatomy, and comes with HD textures 2048×2048 with HD normalmaps on high and low polygons mesh for better and real results on education, games and virtual reality scenes.
Also fully animated with complete cardiac cycle.
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