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Observation of macrophages treated with vehicle, NC, oe-IDO1, 1-MT and oe-IDO1 + 1-MT by SEM (× 8000). IDO1, indoleamine 2,3-dioxygenase-1; NC, negative control; oe, overexpression; 1-MT was the inhibitor of IDO1; SEM, scanning electron microscopy.
