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Fluorescent microscope images of cell morphology after 72 h of ATRA treatment (5 µg/mL). THP-1 cells infected with H37Ra Mtb strain were treated with RPMI and DMSO, unloaded-NPs (blank NPs), 5 μg/mL of free ATRA solution and ATRA-PLGA NPs (corresponding to 5 μg/mL ATRA). Scale bar: 20 µm. Arrows point at elongated macrophages.
