Figure 8. Absence of apoA-1 and IgA from TWEEs.

Sections of mucosal explants cultured for 1 h in the presence of LY and labeled with antibodies to apoA-1 (left panel images) or IgA (right panel images). ApoA-1 was seen faintly in patches at the brush border (arrows) and in numerous punctae scattered in the cytoplasm, but not in the LY-positive TWEEs. Intense labeling for IgA was seen in plasma cells in the lamina propria (LP). In the enterocytes (E), a diffuse labeling was seen throughout the cytoplasm as well as in the brush border, but not in the TWEEs visualized by LY. Bars, 20 µm (A).