nLDs and LAPS in Caco2 cells do not harbor apoCIII or apoAI. A and B: Huh7 and control undifferentiated (Ct) and differentiated (Df) Caco2 cells were immunostained with antibodies against apoAI (panel A) or apoCIII (panel B) and PML, followed by AlexaFluor-555 and AlexaFluor-647 secondary antibodies. LDs were visualized with BODIPY 493/503 and imaged by confocal microscopy (bar, 10 μm). ApoAI- and apoCIII-positive LAPS are indicated by arrows in the Huh7 cell panels. LAPS, lipid-associated promyelocytic leukemia structure; nLD, nuclear lipid droplet; PML, promyelocytic leukemia.