title: Silica deposition in demosponges.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D008854:Microscopy, Electron; D011108:Polymers / Q000378:metabolism; D011161:Porifera / Q000378:metabolism* / Q000648:ultrastructure; D012825:Silicon / Q000378:metabolism*
chemical_list: D011108:Polymers; D012825:Silicon