title: Electron microscopy of siliceous spicules from the freshwater sponge Heteromyenia.
mesh_terms: D000818:Animals; D002244:Carbon; D008854:Microscopy, Electron; D011134:Polysaccharides; D011161:Porifera / Q000166:cytology*; D012822:Silicon Dioxide
chemical_list: D011134:Polysaccharides; D002244:Carbon; D012822:Silicon Dioxide