The 700-million-year history of our blood cells (IMAGE)
Caption
The origin of blood cells can be traced back approximately 700 million years to when human ancestors were single-celled organisms. When these ancestors evolved into multicellular organisms (animals), macrophages emerged as the first blood cells. Over the course of subsequent evolution, various blood cells, such as mast cells, diversified.
Credit
KyotoU / Yosuke Nagahata
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