title: On the fine structure of the frog's rod outer segments, observed by the freeze-etching technique.
mesh_terms: D000818:Animals; D001001:Anura; D005613:Freeze Etching; D008854:Microscopy, Electron; D008859:Microscopy, Polarization; D010786:Photoreceptor Cells / Q000166:cytology*; D013194:Staining and Labeling