Abstract
Sea star Axial organ (A.O) cells were observed in T.EM: Evidence of primitive monocytes was done: They contained azurophile particles and a reniform nucleus, sometimes a phagosome appeared and amoeboid images were seen. These cells, in a second time, evolve mainly in phagocytes which may be assimilated to Vertebrate Macrophages, with functional phagosomes and azurophile particles. The sea star monocytes are smaller in diameter (4 to 5µ) than Vertebrate ones.
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