A morphological study permitted us to show that the epithelioid cell is an active cell, the characteristic vesicles of which seem to be linked to the presence of a glycoprotein substance which passes through the Golgi apparatus and becomes accumlated in the lysosomes owing to their richness in acid phosphatase. A fraction of this substance may be secreted into the extra-cellular medium, without it being possible to determine its precise nature and whether this function is carried out only by this cell.

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