title: An ultrastructural study of silica deposition in the freshwater sponge Spongilla lacustris.
mesh_terms: D000818:Animals; D003593:Cytoplasm; D004721:Endoplasmic Reticulum; D005857:Germanium; D006858:Hydrofluoric Acid; D008566:Membranes; D008854:Microscopy, Electron; D008928:Mitochondria; D011161:Porifera / Q000166:cytology*; D012270:Ribosomes; D012822:Silicon Dioxide
chemical_list: D005857:Germanium; D012822:Silicon Dioxide; D006858:Hydrofluoric Acid