(A) Schematic model depicting the role of midbody during lumen formation. Red marks apical endosomes and apical plasma membrane. AMIS stands for apical membrane initiation site.
(B-D) MDCK epithelial cells grown in Matrigel/Collagen matrix were fixed and immunostained with anti-cingulin (CGN; AMIS marker, antibody generated in the Prekeris lab) and anti-acetylated microtubule (central spindle marker) antibodies. Panel B show a single image plane. Panels C and D show 3D rendering based on the entire Z-stack (reproduced from [(Li, Mangan, et al., 2014a)] with permission from EMBO Reports).