Fig. 4
From: Diverse cell junctions with unique molecular composition in tissues of a sponge (Porifera)
Three types of focal adhesion-like structures in basopinacoderm. a–c Basopinacocytes (cells of the substrate-attachment epithelium) are drawn at the top in profile view, with the mesohyl interface (dorsal surface) at the top and substrate interface (ventral surface) at the bottom. Bundles of actin filaments were found at a ventral surface, and b were sometimes associated with membrane invaginations containing bacteria (white arrowheads). c Actin staining, colored to depict pixel depth within the confocal stack. White arrows indicate dorsal adhesions, from which actin filaments descend ventrally within cell (a, b: red = actin; cyan = DNA)