title: Ultrastructural analysis of the deeper layers of freeze-substituted guinea pig cortex.
mesh_terms: D000818:Animals; D001706:Biopsy; D002540:Cerebral Cortex / Q000032:analysis*; D005110:Extracellular Space; D005613:Freeze Etching; D006168:Guinea Pigs / Q000033:anatomy & histology*; D008297:Male; D008722:Methods; D008854:Microscopy, Electron