title: Orientation of spherical specimens for ultrathin sectioning in selected planes by embedding in agar.
mesh_terms: D000362:Agar; D000818:Animals; D001001:Anura; D004625:Embryo, Nonmammalian; D006652:Histological Techniques; D008722:Methods; D008854:Microscopy, Electron; D008867:Microtomy
chemical_list: D000362:Agar